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Interstate 24

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"I-24" redirects here. For the submarines of the Japanese Imperial Navy, see Japanese submarine I-24.

Interstate 24 marker
Interstate 24
Map
I-24 highlighted in red
Route information
Length316.36 mi[1] (509.13 km)
ExistedAugust 14, 1957[2]–present
NHSEntire route
Major junctions
West end I-57 in Pulleys Mill, IL
Major intersections
East end I-75 / US 74 in East Ridge, TN
Location
CountryUnited States
States
Counties
Highway system
← IL 23IL→ US 24
← US 23KY→ US 25
← SR 23 TN → SR 24
← SR 23GA→ SR 24
← SR 408GA SR 409→ SR 410

Interstate 24 (I-24) is an Interstate Highway in the Midwestern and Southeastern United States. It runs diagonally from I-57, 10 miles (16 km) south of Marion, Illinois, to Chattanooga, Tennessee, at I-75. It travels through Illinois, Kentucky, Tennessee, and Georgia. As an even-numbered Interstate, it is signed as an east–west route, though the route follows a more southeast–northwest routing, passing through Nashville, Tennessee. The numbering deviates from the standard Interstate Highway System grid, lying further north than its number would indicate west of Nashville. The short segment within Georgia bears the unsigned designation State Route 409 (SR 409).

I-24 between Nashville and Chattanooga is part of a longer north–south freight corridor which runs between Chicago and Atlanta. The Interstate has facilitated the rapid growth of the largest suburban corridor in the Nashville metropolitan area, which runs for more than 30 miles (48 km) southeast of the city and is considered the most congested stretch of highway in the state. The stretch through Chattanooga also experiences severe congestion, due to an unusually high volume of truck traffic.[3] The stretch of I-24 across the Cumberland Plateau, commonly known as "Monteagle Mountain", is considered one of the most hazardous stretches of highway in the US, particularly for trucks, due to its steep descents, which measure a maximum of six-percent grade.

As proposed by the Federal-Aid Highway Act of 1956, the western terminus of I-24 was originally located in Nashville. Most of the route between Nashville and Chattanooga was constructed in the 1960s, with the final section opening in 1971. After extensive lobbying from local politicians, the Bureau of Public Roads, the predecessor agency to the Federal Highway Administration, authorized an extension of I-24 to its present-day western terminus in Pulleys Mill, Illinois, in 1964. As a result, I-24 was the last mainline Interstate Highway in Tennessee and Kentucky to be completed, with the last sections in the two states opening in 1978 and 1980, respectively.

Route description

[edit]
Lengths
  mi[1] km
IL 38.73 62.33
KY 93.37 150.26
TN 180.16 289.94
GA 4.10 6.60
Total 316.36 509.13

I-24 runs diagonally from I-57 south of Marion, Illinois, to I-75 at Chattanooga, Tennessee. In Kentucky, the road passes through Paducah and Eddyville. Its length in Tennessee is longer than the other three states combined. There are two segments that are separated by the segment in Georgia. Through Georgia, it carries the unsigned State Route 409 (SR 409) designation for internal Georgia Department of Transportation (GDOT) purposes.[4]

Illinois

[edit]

I-24 begins at exit 44 on I-57 in southern Williamson County, near the community of Pulleys Mill.[5] The highway heads southeast into rural Johnson County, bypassing Goreville to the east. It reaches an exit at Tunnel Hill Road, which serves Goreville and Tunnel Hill. The highway continues south to its next exit at US Route 45 (US 45) north of Vienna. It reaches its next exit at Illinois Route 146 (IL 146) in eastern Vienna. I-24 heads southeast from Vienna into Massac County.[6] Its first exit in Massac County is at Big Bay Road, which serves the communities of Big Bay and New Columbia. I-24 continues southward, bypassing the community of Round Knob before entering Metropolis. The highway meets US 45 again in Metropolis and passes west of Fort Massac State Park. It leaves Metropolis and crosses the I-24 Bridge over the Ohio River. After that, it continues into Kentucky.[7]

Kentucky

[edit]
Whitehaven, the only historic house used as a rest area in the US

I-24 enters the Jackson Purchase region of western Kentucky on a north–south alignment. Immediately within McCracken County, the route begins gradually veering southeast and enters the western fringes of Paducah a few miles later. The welcome center in Paducah utilizes Whitehaven, the only historic house in the United States used as a rest area.[8] In Paducah, the Interstate continues to shift southeast and has interchanges with US 60, US 62, and US 45. Passing through the Hendron and Farley communities adjacent to Paducah, the highway shifts into a direct east–west alignment several miles later and has an interchange with US 68 in Reidland. The route then enters Marshall County and, about seven miles (11 km) later, reaches an interchange with I-69 and a connector road to US 62 and Calvert City to the north. Here, it begins a concurrency with the former. The two Interstates then shift northeast and have an interchange with US 62 about one mile (1.6 km) later. A short distance later, the Interstates cross the Tennessee River onto the Pennyroyal Plateau and Livingston County just north of Kentucky Dam and its Kentucky Lake impoundment. The highways then have an interchange with Kentucky Route 453 (KY 453) north of Lake City and Land Between the Lakes National Recreation Area. They then cross the Cumberland River about three miles (4.8 km) later into Lyon County a few miles north of Barkley Dam and Lake Barkley.[9]

Gradually veering eastward, the two Interstates reach US 62 again near Kuttawa and Eddyville. Less than two miles (3.2 km) later, I-69 splits off to the northeast at a trumpet interchange, and I-24 passes through Mineral Mound State Park, veering southeast a few miles later. Passing through a mostly wooded area, the Interstate crosses KY 93 without an interchange, and then has an interchange with KY 293 near the Kentucky State Penitentiary. It then crosses an inlet of Lake Barkley a few miles later. Some distance later, the freeway enters a landscape consisting mostly of farmland and dips briefly into the southern tip of Caldwell County, where it has an interchange with KY 139. The Interstate then enters Trigg County and crosses the Muddy Fork Little River a short distance later. About five miles (8.0 km) later, the Interstate has an interchange with US 68 and KY 80 between Cadiz and Hopkinsville. The highway then crosses into Christian County a few miles later. Passing over the next several miles through additional farmland and bypassing Hopkinsville to the southwest, the Interstate reaches the southern terminus of I-169 at a trumpet interchange. About four miles (6.4 km) later, the Interstate has a partial cloverleaf interchange with US 41 Alternate, which provides access to Hopkinsville to the north and Fort Campbell and Clarksville, Tennessee, to the south. I-24 then crosses into Tennessee about five miles (8.0 km) later.[9]

Tennessee

[edit]

Clarksville and Western Highland Rim

[edit]

I-24 crosses into Tennessee from Kentucky traveling in a southeasterly-to-northwesterly direction into Montgomery County and serving as a major means of access to St. Louis and Chicago to the northwest. Immediately within the eastern outskirts of Clarksville, the fifth-largest city in Tennessee, the Interstate reaches an interchange with State Route 48 (SR 48), less than one mile (1.6 km) later, which provides access to Trenton in Kentucky to the north. About three miles (4.8 km) later the Interstate reaches US 79, which also provides access to Guthrie and Russellville in Kentucky to the northeast. Bypassing Clarksville to the east, the Interstate next reaches SR 237. The highway then begins a steep descent, with the westbound lanes utilizing a truck climbing lane to ascend the grade from the east. It then crosses the Red River before reaching SR 76.

Leaving Clarksville, the highway enters a long straight section with several steep grades and crosses into Robertson County a short distance later. Several miles later, the Interstate reaches an interchange with SR 49 near Pleasant View and Coopertown, which provides access to Springfield to the northeast and Ashland City to the southwest. The route then descends, utilizing another westbound truck lane, before briefly entering Cheatham County. The Interstate then crosses another steep hill over the next several miles, utilizing an eastbound truck lane before crossing into Davidson County. It then has an interchange with US 431 near the Joelton community and begins a gradual descent into the Nashville Basin, containing a westbound truck lane. Passing over the next few miles through dense woodlands, the highway reaches SR 45 (Old Hickory Boulevard) about five miles (8.0 km) later. Over the next three miles (4.8 km) beyond this point, the Interstate crosses over another steep hill, utilizing truck lanes on both the eastbound and westbound ascent before reaching Nashville at SR 155 (Briley Parkway).

Nashville metropolitan area

[edit]
I-24 eastbound in Nashville concurrent with I-65

Entering Nashville, I-24 has a cloverleaf interchange with SR 155 (Briley Parkway), a northern controlled-access beltway around Nashville. Less than one mile (1.6 km) later, the Interstate joins a concurrency with I-65, where the combined routes carry eight throughlanes and travel due south. About one mile (1.6 km) later is an interchange with US 41A/US 431 (Trinity Lane). About one mile (1.6 km) beyond this point, I-65 splits off and I-24 passes along the east side of downtown Nashville, where it reduces to six lanes and has interchanges with US 41, US 431, and US 31E, and passes near Nissan Stadium. The interstate then crosses the Cumberland River on the Silliman Evans Bridge and joins in a concurrency with I-40, traveling southeast-to-northwest with eight throughlanes. Two miles (3.2 km) later, I-40 splits off eastwardly, heading toward Knoxville. Located at this interchange is also a partial interchange with US 41/US 70S (Murfreesboro Road).[10]

Less than one mile (1.6 km) later is an interchange with the eastern terminus of I-440, which is also accessible from I-40 nearby. Between I-40 and I-440, I-24's eastbound lanes are split into two barrier-separated carriageways to prevent weaving of traffic destined from I-40 to I-440. A short distance later is once again an interchange with SR 155 (Briley Parkway/Thompson Lane) near Nashville International Airport. Beginning at the next exit, SR 255 (Harding Place), the left lanes operate as high-occupancy vehicle (HOV) lanes during rush hour. Over the next few miles, I-24 passes through the Antioch neighborhood, where it has interchanges with Haywood Lane and SR 254 (Bell Road), and crosses Mill Creek. I-24 then continues through southeast Nashville, reaching interchanges with Hickory Hollow Parkway and SR 171 (Old Hickory Boulevard).[10]

I-24 westbound in Smyrna, a suburb of Nashville

Continuing through the southeastern suburbs of Nashville, I-24 crosses into Rutherford County about two miles (3.2 km) beyond. Immediately within the city of La Vergne, the Interstate has an exit with a connector road to that city. It then enters Smyrna where it first has an interchange with SR 266 (Sam Ridley Pkwy.). The Interstate then enters a long straightaway and reaches an interchange with SR 102 (Almaville Road), which also serves Smyrna and the Nissan Smyrna Assembly Plant. Leaving Smyrna, the route enters an unincorporated urban area, before reaching a three-level interchange with I-840, the outer southern beltway around Nashville. I-24 then enters Murfreesboro, the largest suburb of Nashville and sixth-largest city in Tennessee. The Interstate first has an interchange with a local thoroughfare (Medical Center Parkway/Fortress Blvd), before reaching SR 96, which also connects to Franklin. A short distance later, the Interstate crosses the west fork of the Stones River and reaches SR 99 (New Salem Highway). A short distance later, the highway reaches US 231, which also connects to Lebanon and Shelbyville. Here, the HOV lane restriction terminates, and the Interstate reduces from eight to four lanes. Leaving Murfreesboro, the Interstate three miles (4.8 km) later has an interchange with the Joe B. Jackson Parkway, which serves as an outer beltway around southeast Murfreesboro.

Eastern Nashville Basin and Eastern Highland Rim

[edit]
I-24 westbound in Manchester

Upon leaving Murfreesboro, I-24 enters a rural area, passing through a mix of farmland and woodlands and maintaining a straight alignment. Several miles later, the Interstate begins a gradual, largely unnoticeable, ascent out of the Nashville Basin onto the eastern Highland Rim. A few miles later, the Interstate briefly enters Bedford County and then has an interchange with SR 64, which connects to Shelbyville, near the Bedford–Coffee county line. I-24 then briefly descends, curves to the south, then the east, before once again resuming its gradual ascent, where it surpasses an elevation of 1,000 feet (300 m) for the first time in Tennessee.[11] Upon reaching the top of the rim several miles later, the interstate has an interchange with US 41. Five miles (8.0 km) later, the highway enters Manchester, where it crosses the Little Duck River and then has interchanges with SR 53 and SR 55 in short proximity. A short distance later, the highway reaches an interchange with US 41 once again. Leaving Manchester, the Interstate maintains its relatively straight trajectory and passes through the northeastern corner of Arnold Air Force Base over a distance of about three miles (4.8 km). The Interstate then travels over the next 10 miles (16 km) through a wide swath of mostly farmland, before entering Grundy County and reaching an interchange with US 64 and SR 50 near the town of Pelham, where it begins a concurrency with the former route that is largely unsigned. A short distance later, I-24 crosses the Elk River, before reaching the base of the Cumberland Plateau.

Monteagle Mountain and Cumberland Plateau gorge

[edit]
See also: Monteagle Mountain

One of the most hazardous stretches of Interstate Highway in the US is located where I-24 crosses the Cumberland Plateau on steep grades in Grundy and Marion County near the town of Monteagle and is commonly known as "Monteagle Mountain" or "Monteagle". While all motorists are advised to exercise caution along this stretch, truckers are particularly vexed by Monteagle, and many have died in accidents along this stretch. The eastbound grade is particularly hazardous, with a protracted four-to-six-percent grade over several miles. On this stretch, I-24 is three lanes in each direction and contains two runaway truck ramps. Owing to geography, these two ramps are on the left side of the grade. The westbound downgrade of the plateau is also extremely hazardous and contains several sharp curves. Portions of this downgrade also feature offramp approach style lane dividers in order to slow motorists. Throughout the entire stretch across the Cumberland Plateau, the speed limit reduces to a maximum of 55 mph (89 km/h) and 45 mph (72 km/h) for trucks on both downgrades. At top of the Plateau, the Interstate surpasses 2,000 feet (610 m) in elevation, has interchanges with US 41A and US 41, respectively, and crosses into East Tennessee at the Grundy–Marion county line.

The eastern Monteagle grade also has one of the three widest medians of any Interstate Highway; the others are I-8 through the In-Ko-Pah grade in California and I-84 through the Cabbage Hill grade east of Pendleton, Oregon. There is more than one mile (1.6 km) between the eastbound and westbound lanes at one point. The eastbound lanes descend the hill on one side of Monteagle Mountain as part of the original three-lane (two ascending and one descending) US 64 alignment, while the westbound lanes ascend the other side of the hill on new roadbed built for that purpose.

Westbound I-24 at the US 72 interchange

After descending Monteagle, I-24 travels for several miles through a vast flat gorge within the plateau characterized by long straightaways and few curves before reaching an interchange with US 72 near Kimball and South Pittsburg, where US 64 splits off. This exit is the primary means of access to Huntsville, Alabama, for motorists in East Tennessee. About three miles (4.8 km) later, the Interstate has an interchange with SR 28 in Jasper and crosses the Sequatchie River. Beyond this point, the east and westbound lanes split more than one-half mile (800 m) apart over a few miles, encompassing farms, homes, and a few businesses in between. The route then crosses a large mountain ridge, has an interchange with SR 27, and, about one mile (1.6 km) later, crosses the Nickajack Lake impoundment of the Tennessee River. Beyond this point, the highway travels through a narrow gorge over several miles, crossing the Running Water Creek and traveling under its namesake trestle. This stretch is extremely crooked and can experience potentially strong crosswind. The Interstate then enters Hamilton County and the Eastern Time Zone and then crosses into Georgia less than one-quarter mile (400 m) later.

Georgia and Chattanooga

[edit]
Westbound I-24 in northwest Georgia at the interchange with I-59

In the state of Georgia, I-24 travels for four miles (6.4 km) in Dade County along the southern flank of Raccoon Mountain. Along this stretch, exits remain numbered according to Tennessee's mileage; however, the roadway mileposts are numbered according to Georgia's mileage.[12] This segment also carries the unsigned SR 409 designation for internal GDOT purposes.[4] About 1.5 miles (2.4 km) after entering the state, the Interstate has an interchange with the northern terminus of I-59, which provides access to Birmingham, Alabama, to the southwest. The route then shifts north and has an interchange with SR 299 in Wildwood about one mile (1.6 km) later before turning back north and reentering Tennessee about 0.75 miles (1.21 km) later.

I-24 eastbound in Chattanooga concurrent with US 27

Upon reentering Tennessee and Hamilton County, I-24 travels through Tiftonia for several miles and has an interchange with US 11/US 41/US 72 (Lee Highway) about three miles (4.8 km) later near the Tiftonia neighborhood. About two miles (3.2 km) later, the Interstate curves sharply to the east, traveling on a narrow artificial causeway between the Tennessee River to the north and the northern tip of Lookout Mountain to the south. A short distance later, the Interstate gradually curves 90 degrees to the north, entering Chattanooga. Less than one mile (1.6 km) later is a three-way interchange with US 27 (unsigned I-124 northbound) northbound, which provides access to downtown Chattanooga directly to the north. Forming an unsigned concurrency with US 27, the highways sharply curve 90 degrees to the east, before widening to eight lanes. I-24 then briefly dips to the south, where it has a trumpet interchange with a connector to SR 8. A short distance later, US 27 splits off to the south at a near-cloverleaf interchange as Rossville Boulevard, where the Interstate reduces to six lanes. It then travels through the south side of Chattanooga before reaching a partial interchange with US 41/US 76. Here, I-24 reaches the "Ridge Cut", a one-quarter-mile (400 m)[clarification needed] stretch where the Interstate ascends Missionary Ridge on a steep grade, first curving sharply to the north at the bottom of the ascent and then to the east again at the top. This stretch is notorious for severe congestion and is especially hazardous to truckers. At the top of the Ridge Cut, the Interstate enters a straight section and begins a gradual descent over a short distance. Traveling roughly along the boundary between Chattanooga and East Ridge, the Interstate has interchanges with multiple local thoroughfares over the next several miles. It then reaches its eastern terminus with I-75 at a semi-directional T interchange, known locally as the "75/24 Split" or simply "The Split".

History

[edit]

A controlled-access highway between Nashville and Chattanooga was first included in the National Interregional Highway Committee's 1944 report, titled Interregional Highways, and a subsequent 1947 plan produced by the Public Roads Administration of the now-defunct Federal Works Agency.[13][14] The route was subsequently part of the original 1,047.6 miles (1,685.9 km) of Interstate Highways authorized for Tennessee by the Federal-Aid Highway Act of 1956, commonly known as the Interstate Highway Act.[15] The numbering was approved by the American Association of State Highway and Transportation Officials (AASHTO) on August 14, 1957.[2] While most of the routing of I-24 proved was chosen without difficulty, the mountainous topography of the Chattanooga area posed a challenged to planners. The route was initially slated to pass near 38th Street through the Alton Park and East Lake neighborhoods, but was moved approximately 1.5 miles (2.4 km) north in August 1955. The route was also planned to pass through a tunnel under Missionary Ridge until October 1960, when planners announced that a 120-foot (37 m) deep and 850-foot (260 m) wide cut would be made through the ridge.[16] Engineers also initially recommended that the Interstate cross the Tennessee River onto Moccasin Bend south of downtown, and then again cross the river into Lookout Valley a short distance beyond, but this was rejected by the Bureau of Public Roads in April 1958 as too expensive.[17][18]

1955 Bureau of Public Roads highway plan for Nashville, showing the highway that became I-24 terminating there

In 1957, officials in Tennessee, Kentucky, Illinois, and Missouri began an effort to extend I-24 west of its allocated western terminus in Nashville to St. Louis; however, each of the states had difficulty reaching an agreement on the proposed routing.[19] Eventually, the debate evolved into two proposed alignments for the extension in Tennessee. The first alignment extended I-24 west of Nashville into Kentucky near Clarksville, and the second would have had I-24 run concurrent with I-40 west of Nashville for about 40 miles (64 km) to near Dickson, before splitting off to the northwest and crossing the Kentucky Lake impoundment of the Tennessee River a few miles before entering Kentucky.[19] This latter alignment was favored by many officials in Tennessee and Western Kentucky, but the federal government preferred the former, due to its proximity to Fort Campbell.

On September 17, 1963, the governors of the four states in a meeting with President John F. Kennedy reached an agreement on the alignment, which included the Nashville-to-Clarksville alignment in Tennessee and extended the route's western terminus to Pulleys Mill, Illinois.[20] The four governors also urged the approval of a new east–west Interstate Highway to run between Hayti, Missouri, and Jackson, Tennessee, incorporating a then-unbuilt bridge across the Mississippi River that had been proposed since the early 1940s.[21] On August 18, 1964, the Bureau of Public Roads, the predecessor agency to the Federal Highway Administration, approved the I-24 extension; however, they only authorized the westernmost 27 miles (43 km) of the route between Missouri and Tennessee, which was designated as I-155 and terminates in Dyersburg, Tennessee.[22][23]

Sign for I-24 westbound in South Pittsburg, Tennessee, in September 1972

The first section of I-24 to be completed was the section in Chattanooga between SR 58 (Market Street) and east of the railyard overpass, which was let to contract on September 18, 1957, and dedicated and opened on December 23, 1958. This was the first section of freeway in Chattanooga and the first section of Interstate in East Tennessee constructed under the Interstate Highway System.[24][25][26] The interchange with I-75, along with the segment of I-75 extending to the Georgia state line, were let to contract on July 26, 1959, and dedicated on May 31, 1961.[27][28][29] The first major section to be completed was the western ascent of Monteagle Mountain, which stretched from US 64 near Pelham to US 41 in Monteagle and eliminated a stretch of US 41 with several hazardous hairpin curves.[30] Work began in September 1958,[31] and the stretch opened to traffic on February 6, 1962.[32] The short segment in Chattanooga between Belvoir Avenue and I-75 opened in late October 1962.[33] This was followed by the short stretch between east of the railyard and Fourth Avenue on January 3, 1963.[34][35]

In Nashville, a short segment of the concurrent segment with I-40, located between Fesslers Lane and the eastern interchange with that route, was declared complete on January 11, 1965.[36] The section between the western interchange with I-40 (then also I-65) and Fesslers Lane was partially opened in late December 1963[37] and fully opened on April 19, 1965.[38] The Silliman Evans Bridge, along with the stretch extending from US 41 (First Street) and I-40 was dedicated on January 14, 1964.[39] On July 27, 1965, the short section between US 431 (Trinity Lane) and US 41 (First Street) was opened.[40] This section included provisions for the southern interchange with I-65 (then I-265), which had not been built yet. The Ridge Cut section in Chattanooga, which spanned between Fourth Avenue and Germantown Road, was dedicated on December 1, 1965.[16][41] To construct the segment at the foot of Lookout Mountain west of downtown Chattanooga, engineers shifted the river channel to the north in order to avoid impeding the flow. This was accomplished by dredging out the north bank and filling in along the south bank with approximately 250,000 short tons (230,000 t; 220,000 long tons) of rock from a nearby quarry.[18] This stretch of I-24, which spanned from US 41 in Lookout Valley to 23rd Street near downtown Chattanooga, was completed on December 16, 1966, at a cost of approximately $15 million (equivalent to $108 million in 2023[42]), making it one of the most expensive highway projects, per mile, at the time.[43]

I-24 was complete in Marion County to Monteagle Mountain in late 1966 and between US 41 in Manchester and US 64 near Pelham on July 27, 1967.[44] The short segment between SR 27 and SR 156 in Marion County, including the bridge over Nickajack Lake, opened on December 18, 1967.[45] The stretch between US 41 in Lookout Valley and the interchange with I-59 in Dade County, Georgia, was jointly opened to traffic by both states on September 10, 1968, along with the eight-northernmost-miles (13 km) of I-59.[46] This was followed by the adjacent section extending west to SR 156 in early November 1968.[47][48] In Nashville, the short section between US 431 and the northern interchange with I-65, along with a short stretch of I-65 north of this section, opened to traffic on December 23, 1968.[49] The section between US 41 in northwestern Coffee County and US 41 in Manchester opened on December 3, 1969.[50] On December 9, 1970, I-24 opened between US 231 in Murfreesboro and SR 64 near Beechgrove.[51] The route was opened between SR 171 in Nashville and US 231 in Murfreesboro on December 31, 1970.[52] The last segment of I-24 between Nashville and Chattanooga, the segment located between SR 64 near Beechgrove and US 41 northwest of Manchester, was let to contract on January 31, 1969,[53] and opened and dedicated on December 16, 1971.[54]

Construction began on I-24 between the Kentucky line and SR 48 in Clarksville on April 12, 1971.[55] In February 1972, the FHWA announced that it was redistributing funds that had been budgeted for Interstate construction in Tennessee to other states which were further behind on their Interstates. I-24 between Nashville and Kentucky was one of the sections affected by this cutback, which threatened to delay completion.[56] In response, the state legislature authorized the issuance of $100 million (equivalent to $553 million in 2023[42]) in bonds to finance the completion of I-24.[57][58] This allowed for TDOT to let contracts for the remaining sections between Nashville and Clarksville from September to November 1972.[59][60][61] Once construction on the remainder of I-24 between Clarksville and Nashville was underway, the route was projected to be completed in late 1974 or early 1975, but would experience further delays as a result of geological problems.[62] Construction on this approximately 44-mile (71 km) segment, the last segment of mainline Interstate Highway completed in Tennessee, proved to be difficult due to the rugged and hilly terrain.[63] The approximately 32-mile (51 km) segment between US 68 in Hopkinsville, Kentucky, and US 79 in Clarksville, Tennessee, was jointly opened to traffic by both states on September 12, 1975.[64][65] The 15-mile (24 km) section between US 79 and SR 49 in Robertson County was completed in September 1976.[66] The last segment of I-24 in Tennessee, between SR 49 and I-65 in Nashville, was opened to traffic on January 5, 1978, more than two years behind schedule.[62][67]

The Silliman Evans Bridge was widened from six to eight lanes in a project that completely closed the northbound span between January 20, 1974, and April 6, 1975, and the southbound span from April 6, 1975, to November 16, 1975.[68][69][70] This project also added shoulders to the bridge and removed railings that had been deemed unsafe and were believed to have played a role in multiple fatal accidents on the bridge.[68]

I-24 Bridge connecting Illinois with Kentucky across the Ohio River

A groundbreaking ceremony for the first stretch of I-24 in Kentucky was held on December 6, 1967, in Lyon County.[71][72] The section of I-24 in Illinois was authorized for engineering by 1966 and authorized for construction by 1968.[73][74] The first section of I-24 in Illinois, located between US 45 in Vienna and US 45 in Metropolis, was dedicated and opened by Governor Dan Walker on January 15, 1974.[75] On October 18, 1974, the stretch between US 45 in Metropolis and US 60 in Paducah, including the Ohio River bridge, opened to traffic.[76] This was also the first stretch of I-24 to open in Kentucky.[77] The final segment of I-24 in Illinois, located between I-57 and US 45 in Vienna, was dedicated and opened to traffic by Governor Walker on January 24, 1976.[78] In October 1977, the stretch between US 68 in Reidland and US 62 east of Calvert City was completed.[77]

The 2.5-mile (4.0 km) section between US 62 near Calvert City and KY 453, including the Tennessee River Bridge, which had been completed approximately five years prior, was opened to traffic on October 25, 1979.[79] The section between US 60 in Paducah and US 68 in Reidland was opened and dedicated by Governor Julian Carroll on December 15, 1978.[80] On December 10, 1979, the stretch between KY 453 and US 60/US 641 in Eddyville, including the Cumberland River Bridge, was opened.[81] Construction on the bridge began in 1972, but issues caused by unusual rock formations at the site, believed to have been formed by the 1811–1812 New Madrid earthquakes or earlier quakes, delayed completion and resulted in the cost nearly tripling.[82] On March 20, 1980, the 2.7-mile (4.3 km) stretch in Eddyville between US 62/US 641 and the Western Kentucky Parkway (now I-69), along with the westernmost 3.4 miles (5.5 km) of the latter route, was opened.[83] I-24 was completed when the 23-mile (37 km) section opened to traffic from what is now I-69 to US 68 east of Cadiz on May 23, 1980.[77][84]

In November 1977, the Tennessee Department of Transportation (TDOT) installed a system to detect tailgating vehicles in the westbound lanes of the concurrent segment with I-40, which consisted of sensors embedded in the roadway connected to overhead warning signs with flashing lights and horns.[85][86] The system was the first of its kind in the country but experienced technical problems and was criticized as ineffective, leading to its decommission in July 1980.[87] This segment was widened from six to eight lanes between July 1979 and January 1980 by removing the right shoulders, narrowing the lanes by one foot (0.30 m), and shifting traffic slightly to the left.[88][89]

A project began in April 1985 that extensively straightened and rebuilt the eastbound lanes of I-24 on the eastern downgrade of Monteagle Mountain and reduced the grade.[90] The project also added left shoulders and an additional runaway truck ramp, the latter of which was not originally planned.[91] This work was completed in 1989, and the lanes were reopened on July 11 of that year in a ceremony officiated by Governor Ned McWherter.[90] The project experienced many setbacks including geological problems, which caused extensive delays.[92] Originally targeted for completion in December 1987 at a cost of $17 million (equivalent to $39.1 million in 2023[42]), the final cost was $29.5 million (equivalent to $63.1 million in 2023[42]).[90] During this project, both directions of traffic were routed to the westbound lanes of I-24, which were separated by a Jersey barrier, and a temporary runaway truck ramp for eastbound traffic was also provided along this alignment.[92] A truck station to allow for the adjustment of brakes opened in January 1992.[93] After the safety improvements were completed, accidents in the eastbound lanes of this stretch dropped from 54 in 1983 to 3 in 1991.[93]


The 4.7-mile (7.6 km) stretch between near SR 255 (Harding Place) and near SR 254 (Bell Road) was widened to six lanes between April 1989 and November 1990.[94][95] Between November 1994 and November 1995, TDOT made safety modifications to I-24 through the eastern terminus with I-440 and the nearby split with I-40, which reconfigured the routes to provide direct access to I-440 westbound from I-40 westbound, splitting I-24's eastbound lanes into two barrier-separated carriageways.[96][97]

The approximately 9.3-mile (15.0 km) segment between Haywood Lane in Nashville and SR 266 in Smyrna was widened from four to eight lanes between June 1997 and December 1998, installing the first HOV lanes on I-24.[98] The 8.2-mile (13.2 km) portion between SR 266 and I-840 was widened from four to eight lanes between August 1998 and November 2000. The four-mile (6.4 km) segment between I-440 and Haywood Lane was widened from three to four lanes in each direction between March 2000 and May 2002 in a project that also improved the interchanges on this segment.[99] Widening of the segment between I-840 and SR 96 began in early 2004 and was completed in the summer of 2005.[100] This project added a new interchange at Medical Center Parkway. A project that widened I-24 from four to eight lanes between SR 96 and US 231, and also added a new interchange with SR 99, began in April 2006 and was completed on January 28, 2008.[101]

In Chattanooga, the stretch between the bottom of the Ridge Cut and east of the Big Scramble was widened from four to six lanes in the mid- to latter 1980s. Between May 1989 and November 1991, the Big Scramble was modified in a project that eliminated left-hand entrance and exit ramps, widened parts of the main carriageway, and converted the westbound lanes of I-24 into the ramp carrying I-24 westbound traffic to US 27 northbound.[95]

The original interchange with I-75, which was a simple directional T design, had repeatedly been ranked as one of the top 10 worst freight bottlenecks in the US by the American Transportation Research Institute and contained several sharp curves and other safety hazards. In December 2018, a contract was awarded to rebuild the interchange, with preliminary work beginning in May 2019.[102][103] The project consisted of eliminating left-hand entrance and exit ramps from I-75 onto I-24, straightening curves, widening I-75 to six lanes through the interchange, widening two ramps from I-75 to I-24 to three lanes, replacing two overpass bridges, and construction of a collector–distributor facility that carries traffic directly from US 41 and the Tennessee Welcome Center along I-75 northbound, providing direct access to both I-75 northbound and I-24 westbound. Additional space was also provided to widen the remaining ramps between I-75 and I-24 to three lanes, which will be done in the second phase.[104] The project was completed on August 19, 2021, at a cost of $133.5 million, making it the second-most expensive individual contract in state history at the time.[105] The second phase will widen the adjacent segment of I-24 west of the interchange and lengthen auxiliary lanes on I-75 about 1.5 miles (2.4 km) north of the interchange.[105] In preparation for the second phase, the Belvoir Avenue overpass and Germantown Road underpass were replaced between May 2020 and August 2021; the latter replacement utilized accelerated bridge construction by shifting I-24 traffic onto the Germantown Road entrance and exit ramp and adjacent frontage roads.[106]

I-24 SMART Corridor

[edit]

The 28-mile (45 km) stretch of I-24 between I-440 (exit 53) in Nashville and US 231 (exit 81) in Murfreesboro is currently in the process of being developed into the "I-24 SMART Corridor" in an effort to address congestion and mobility issues.[107] In recent years, this stretch of I-24 has become the most congested highway corridor in the state, due to the rapid growth of the region. The project pairs this stretch with the adjacent paralleling stretch of US 41/US 70S (Murfreesboro Road) and all connecting roads in between. The first phase, which ran from October 2018 to December 2021, included the construction of emergency pull-offs, improvements to multiple entrance and exit ramps, the erection of additional roadside dynamic-message signs (DMSs), and upgrades to traffic signals along the corridor.[108] The second phase, which began in March 2022, includes the erection of 67 overhead gantries with signs between mileposts 53 and 70 that will display recommended variable speed limits and variable lane control signs for each lane.[109][110] The final phase will include the installation of ramp meters on certain onramps and the installation of additional closed-circuit television (CCTV) cameras and DMS boards and Americans with Disabilities Act of 1990 (ADA) improvements along connecting arterials.[108]

Major incidents

[edit]

On July 27, 1973, a station wagon traveling on the northbound span of the Silliman Evans Bridge in Nashville crashed through the bridge's guardrails, exited the roadway, and landed on the ground about 100 feet (30 m) below, killing eight of the nine occupants and injuring the other.[111] The accident was investigated by the National Transportation Safety Board (NTSB), which named a number of unsafe design features of the bridge as contributors to the crash. The report also concluded that the state had been aware of the safety hazards of the bridge's rails prior to the accident, which had played a role in previous fatal accidents on the bridge.[112][113] This accident was cited as the primary event that led to the widening project on the bridge months later.

In 1979, structural problems were discovered on the Ohio River Bridge, including 119 cracks as a result of defective welding in the tie girders.[114] The bridge was closed on August 3, 1979, and remained closed to all traffic through October 1980 and all truck traffic until mid-1981.[115]

On May 18, 2010, it was announced that a sinkhole was found in the eastbound lanes of I-24 in Grundy County near the exit to US 64/SR 50 (exit 127). TDOT officials stated that the hole was growing and diverted traffic onto the westbound lanes.[116] Following emergency repairs, the highway was reopened several days later.[117]

Future

[edit]

TDOT and GDOT are jointly making preparations to widen the 10-mile (16 km) stretch of I-24 from I-59 to US 27 in Chattanooga to six lanes. This project is expected to be split into three phases, due to its location within two states and the difficulties of expanding the stretch which is located on a narrow artificial causeway between Lookout Mountain and the Tennessee River. This stretch has long experienced severe congestion issues and is considered a major bottleneck, particularly for trucks.[118]

Other stretches of I-24 planned to be widened in the near future include the stretch through Clarksville, the stretch between SR 45 and I-65 northwest of Nashville, and the eastern leg of the downtown loop in Nashville between I-65 and I-40.[119][120]

Exit list

[edit]
StateCountyLocationmi[121][122][123]kmExit[124]DestinationsNotes
IllinoisWilliamsonSouthern Precinct0.000.00—
 I-57 north – Chicago		Western terminus
—
 I-57 south – Memphis		Westbound exit and eastbound entrance; exit 44 on I-57
JohnsonTunnel Hill7.2211.627 CR 12 (Tunnel Hill Road) – Tunnel Hill, Goreville
Bloomfield13.6421.9514 US 45 – Vienna, Harrisburg
Vienna16.0025.7516 IL 146 – Vienna, Golconda
MassacGeorges Creek Precinct26.5542.7327 CR 10 (Big Bay Road) – New Columbia, Big BayNo services
Metropolis37.1659.8037 US 45 – Metropolis, BrookportAccess to Fort Massac State Park
Rest Area
Ohio River38.73
0.000		62.33
0.000		Interstate 24 Bridge; Illinois–Kentucky state line
KentuckyMcCrackenPaducah2.9584.7603 KY 305 – Paducah
4.3286.9654
 I-24 BL east / US 60 – Paducah, Wickliffe		Western terminus of I-24 Bus.; access to Kentucky Oaks Mall
6.387–
6.865		10.279–
11.048		7 US 45 / US 62 – Bardwell, Mayfield
​11.03517.75911
 I-24 BL west / KY 1954 (Husband Road) – Paducah		Eastern terminus of I-24 Bus.
​16.15325.99616 US 68 – Paducah
Marshall​24.96140.17125
 I-69 south – Fulton, Calvert City		Western end of I-69 concurrency; signed as exits 25A (south) and 25B (north)
Calvert City26.56542.75227 US 62 – Kentucky Dam, Calvert City
Livingston​30.72949.45431 KY 453 – Grand Rivers, SmithlandServes Land Between the Lakes National Recreation Area
LyonKuttawa39.55363.65440 KY 93 / US 62 / US 641 – Eddyville, Kuttawa
Eddyville41.64767.02442
 I-69 north / Western Kentucky Parkway (to KY 9001) – Henderson, Elizabethtown		Eastern end of I-69 concurrency; I-69 exit 68
​44.73271.98945 KY 293 – Princeton
Caldwell​55.63289.53156 KY 139 – Princeton, Cadiz
TriggCadiz65.313105.11165 US 68 / KY 80 – Cadiz, HopkinsvilleServes Land Between the Lakes National Recreation Area
Christian​72.692116.98673 KY 117 – Newstead, Gracey
​81.243130.74881
 I-169 north – Hopkinsville		Southern terminus of I-169, formerly known as the Pennyrile Parkway; exit 1 on I-169
Hopkinsville–Oak Grove line85.608137.77386
 US 41 Alt. – Hopkinsville, Fort Campbell
Oak Grove88.761142.84789 KY 115 – Oak Grove, PembrokeServes the Jefferson Davis Monument State Historic Site
 93.373
0.00		150.269
0.00		Kentucky–Tennessee state line
TennesseeMontgomeryClarksville1.612.591 SR 48 – Clarksville, Trenton
4.517.264 US 79 (LG Highway / Wilma Rudolph Boulevard) – Clarksville, GuthrieAccess to Austin Peay State University and Tennessee College of Applied Technology at Clarksville
7.9512.798 SR 237 (Hankook Road / Rossview Road)Access to Dunbar Cave State Park
10.6117.0811 SR 76 (Dr. Martin Luther King Jr. Parkway) – Clarksville, AdamsAccess to Port Royal State Park
Robertson​19.1730.8519 SR 256 (Maxey Road) – Adams
Pleasant View–Coopertown line24.4139.2824 SR 49 – Springfield, Ashland City
Cheatham​31.0249.9231 SR 249 (New Hope Road)
DavidsonNashville35.1656.5835 US 431 – Springfield, Joelton
40.7065.5040 SR 45 (Old Hickory Boulevard)
43.4069.8543 SR 155 (Briley Parkway)SR 155 exits 18A-B; access to Nashville International Airport
44.17–
44.81		71.08–
72.11		44 I-65 – Louisville, NashvilleWestern end of I-65 concurrency; signed as exits 44A (south) and exit 44B (north) eastbound; I-65 exit 88
45.7973.6987 US 431 (Trinity Lane)Exit number follows I-65.
46.42–
47.05		74.71–
75.72		46B


 I-65 south to I-40 west – Memphis, Huntsville		Southern end of I-65 concurrency; I-65 exit 86 southbound; signed as exits 46A (I-24 west/I-65 north) and 46B (I-65 south) westbound
47.63–
47.93		76.65–
77.14		47North First Street / Jefferson Street
47.9377.1447A US 31E (Ellington Parkway) / Spring Street
48.43–
48.51		77.94–
78.07		48James Robertson Parkway (US 31 / US 41 / US 431) – State Capitol
48.9078.7049Korean Vets Boulevard / Shelby Avenue – Nissan Stadium
49.33–
49.93		79.39–
80.35		Silliman Evans Bridge over the Cumberland River
49.74–
50.06		80.05–
80.56		50


 I-40 west to I-65 south – Memphis, Huntsville		Western end of I-40 concurrency; signed as I-40 exit 211 westbound; signed as exits 50A (I-40 east/I-24 east) and 50B (I-40 west to I-65 south) eastbound
50.4281.14212Hermitage Avenue (US 70)Westbound exit; exit number follows I-40
50.9782.03Fesslers LaneEastbound exit
51.44–
51.85		82.78–
83.44		52B
 I-40 east – Knoxville		Eastern end of I-40 concurrency; I-40 exit 213A; access to Nashville International Airport
51.8583.4452 US 41 / US 70S (Murfreesboro Road)
52.19–
53.04		83.99–
85.36		53
 I-440 west – Memphis		Eastern terminus of I-440
53.7086.4254 SR 155 (Briley Parkway)SR 155 exits 3A-B
55.7189.6656 SR 255 (Harding Place)Access to Nashville International Airport
57.0291.7657Haywood Lane – AntiochSigned as exits 57A (west) and 57B (east) eastbound
59.4095.6059 SR 254 (Bell Road)
60.0896.6960Hickory Hollow Parkway / William Turner Parkway
62.54100.6562 SR 171 (Old Hickory Boulevard)
RutherfordLa Vergne64.55103.8864Waldron Road – La Vergne
Smyrna66.30106.7066
 SR 266 east (Sam Ridley Parkway) – Smyrna		Signed as exits 66A (west) and 66B (east) eastbound
69.90112.4970 SR 102 (Nissan Drive / Lee Victory Parkway / Almaville Road) – Smyrna
​74.12–
75.11		119.28–
120.88		74 I-840 – Memphis, Franklin, Knoxville, LebanonSigned as exits 74A (west) and 74B (east); I-840 exit 53 eastbound, 53A-B westbound
Murfreesboro76.21122.6576Fortress Boulevard / Medical Center Parkway
77.98125.5078 SR 96 – Franklin, MurfreesboroSigned as exits 78A (west) and 78B (east)
79.80128.4380 SR 99 – Murfreesboro
81.23130.7381 US 231 – Shelbyville, MurfreesboroSigned as exits 81A (south) and 81B (north) eastbound
83.58134.5184Joe B. Jackson ParkwaySigned as exits 84A (south) and 84B (north) eastbound
​88.79142.8989Buchanan – Epps Mill Road
Coffee–Bedford
county line		​96.85155.8697 SR 64 (Beechgrove Road) – Shelbyville
Coffee​105.23169.35105 US 41
Manchester110.22177.38110 SR 53 – Manchester, Woodbury
111.23179.01111 SR 55 – Manchester, Tullahoma, McMinnvilleSigned as exits 111A (south) and 111B (north) eastbound
113.77183.10114 US 41 – Manchester
Arnold AFB117.20188.62117Arnold Air Force Base – Tullahoma
GrundyPelham127.54205.26127
 US 64 west / SR 50 – Pelham, Winchester		West end of US 64 concurrency
MonteagleRest area
Marion–Grundy
county line		134.33216.18134 US 41A – Monteagle, Sewanee
Marion135.48218.03135

 To US 41 north – Monteagle, Tracy City		Western end of SR 2 concurrency
​142.94230.04143Martin Springs RoadEastern end of SR 2 concurrency
Kimball151.93244.51152

 US 64 east / US 72 to US 41 – Kimball, South Pittsburg		Eastern end of US 64 concurrency; western end of SR 27 concurrency
Jasper155.62250.45155 SR 28 – Jasper, Dunlap
​158.68255.37158
 SR 27 east – Nickajack Dam, Powells Crossroads		Eastern end of SR 27 concurrency
​160.34–
160.94		258.04–
259.01		Interstate 24 Bridge over the Nickajack Lake
Haletown161.33259.64161 SR 156 – Haletown, New Hope
Hamilton
 No major junctions
 166.9
0.00		268.6
0.00		Tennessee–Georgia state line
GeorgiaDade​0.847–
1.63		1.363–
2.62		167
 I-59 south – Birmingham		Left exit and entrance westbound; exit numbers continue from Tennessee numbering; northern terminus of I-59
​3.555.71169
 SR 299 to US 11 – Wildwood
 4.13
171.0		6.65
275.2		Georgia–Tennessee state line
TennesseeHamiltonChattanooga173.7279.5174
 US 41 / US 64 to US 11 – Lookout Valley, Lookout Mountain
175.0281.6175Browns Ferry Road – Lookout Mountain
178.8–
179.3		287.8–
288.6		178
 US 27 north / US 11 / US 41 / US 64 (Broad Street) / SR 58 (Market Street) – Downtown Chattanooga, Lookout Mountain		Western end of US 27 concurrency; southern terminus of unsigned I-124
180.0289.7180


 US 27 south (Rossville Boulevard) to SR 8 north / Central Avenue		Eastern end of US 27 concurrency; signed as exits 180A (north) and 180B (south)
180.9291.1181Fourth Avenue
181.4291.9181A
 US 41 south – East Ridge		Eastbound exit and westbound entrance
182.0292.9Missionary Ridge crossing
Chattanooga–East Ridge line183.0294.5183ABelvoir Avenue / Germantown RoadSigned as exit 183 eastbound
East Ridge184.0296.1184Moore Road
185.2298.1185 I-75 (US 74 east) – Atlanta, KnoxvilleEastern terminus; signed as exits 185A (south) and 185B (north); exit 2 on I-75
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
[edit]

Interstate 124

[edit]
Main article: Interstate 124
Interstate 124 marker
Interstate 124
LocationChattanooga, Tennessee
Length1.97 mi[125] (3.17 km)
ExistedNovember 12, 1958[126]–present

Interstate 124 (I-124) is an unsigned designation for a short segment of a four-lane controlled-access highway located in Chattanooga, Tennessee. During periods where this two-mile-long (3.2 km) segment of US 27 has been signed as I-124, it has served as a spur route of I-24 to downtown Chattanooga. The road segment has not been signed as I-124 since the late 1980s (it is marked on overhead signs and milemarkers as US 27),[127] and the TDOT official map no longer designates it as I-124, but some TDOT publications still make reference to the designation.[128]

Paducah business loop

[edit]
Interstate 24 Business marker
Interstate 24 Business
LocationPaducah, Kentucky
Length11.2 mi[129] (18.0 km)
Existed2002–present

Interstate 24 Business (I-24 Bus.) is an 11.2-mile (18.0 km) business loop of I-24 that travels through downtown Paducah, Kentucky, that begins at I-24 and US 60 at exit 4 and ends at I-24 and KY 1954 at exit 11. Originally designated as Interstate 24 Downtown (I-24 Dwtn.), the route was repurposed as I-24 Bus. in 2002. The highway follows US 60, US 60 Bus., and KY 1954.

Major Intersections
The entire route is in McCracken County.

Locationmi[129]kmDestinationsNotes
Paducah0.00.0
 US 60 west (Hinkleville Road west) / I-24		Western terminus; western end of US 60 concurrency; I-24 exit 4
1.93.1
 KY 731 south (32nd Street)		Northern terminus of KY 731
2.43.9
 US 60 east (Joe Clifton Drive)


 US 60 Bus. east		Eastern end of US 60 concurrency; I-24 Bus. east follows US 60 Bus. east; US 60 east serves Baptist Health Paducah
2.64.2 US 45 (H.C. Mathis Drive)
4.47.1

 US 45 Bus. north (8th Street)		Western end of US 45 Bus. concurrency
5.28.4

 US 45 Bus. south (Kentucky Avenue)		Eastern end of US 45 Bus. concurrency
8.213.2

 US 60 Bus. west
US 60 / US 62

 KY 1954 east		I-24 Bus. west follows US 60 Bus. west; I-24 Bus. east follows KY 1954 east
Woodlawn-Oakdale8.814.2 KY 450
10.917.5
 KY 2187 north (Husband Road north)		Southern terminus of KY 2187
​11.218.0
 KY 1954 east (Husband Road) / I-24 – Kentucky Dam, Nashville, St. Louis		Eastern terminus; eastern end of KY 1954 concurrency; I-24 exit 11
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also

[edit]

References

[edit]
  1. ^ a b Starks, Edward (January 27, 2022). "Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved March 23, 2023.
  2. ^ a b Public Roads Administration (August 14, 1957). Official Route Numbering for the National System of Interstate and Defense Highways as Adopted by the American Association of State Highway Officials (Map). Washington, DC: Public Roads Administration. Retrieved June 14, 2018 – via Wikimedia Commons.
  3. ^ Pare, Mike (February 15, 2015). "Forget trains. Chattanooga is No. 1 in the nation for truck traffic". Chattanooga Times Free Press. Archived from the original on January 11, 2022. Retrieved January 11, 2022.
  4. ^ a b Georgia Department of Transportation (2002). Official Highway and Transportation Map (PDF) (Map) (2002–2003 ed.). Scale not given. Atlanta: Georgia Department of Transportation. Retrieved April 6, 2017.
  5. ^ Illinois Department of Transportation (2010). Williamson County General Highway Map (PDF) (Map). Springfield: Illinois Department of Transportation. Archived (PDF) from the original on March 6, 2012. Retrieved January 9, 2011.
  6. ^ Illinois Department of Transportation (1994). Johnson County General Highway Map (PDF) (Map). Springfield: Illinois Department of Transportation. Archived (PDF) from the original on March 6, 2012. Retrieved January 9, 2011.
  7. ^ Illinois Department of Transportation (2001). Massac County General Highway Map (PDF) (Map). Springfield: Illinois Department of Transportation. Archived (PDF) from the original on March 6, 2012. Retrieved January 9, 2011.
  8. ^ "Whitehaven Welcome Center Celebrates 40th Anniversary". WPSD-TV. June 24, 2023. Retrieved June 24, 2023.
  9. ^ a b Kentucky Transportation Cabinet (2020). Kentucky Official Highway Map (Map) (2020–2021 ed.). Scale not given. Frankfort: Kentucky Transportation Cabinet. Retrieved June 23, 2022.
  10. ^ a b Long Range Planning Division Office of Data Visualization (2018). Davidson County (PDF) (Map). Tennessee Department of Transportation.
  11. ^ Topographic-Map.com (January 22, 2022). "Tennessee" (Map). Topographic-Map.com. Retrieved January 22, 2022.
  12. ^ Deck, Ben (January 16, 2000). "DOT to Change Interstate Exit Numbers". Athens Banner-Herald. Archived from the original on October 29, 2017. Retrieved April 6, 2017.
  13. ^ Weingroff, Richard F. "Designating the Urban Interstates". Federal Highway Administration. Retrieved August 5, 2018.
  14. ^ Public Roads Administration (August 2, 1947). National System of Interstate Highways (Map). Scale not given. Washington, DC: Public Roads Administration. Retrieved September 4, 2010 – via Wikimedia Commons.
  15. ^ Tennessee State Highway Department Highway Planning Survey Division; Bureau of Public Roads (1959). History of the Tennessee Highway Department (PDF) (Report). Nashville: Tennessee State Highway Department. pp. 51–52. Archived (PDF) from the original on January 23, 2020. Retrieved April 26, 2020.
  16. ^ a b Jolley, Harmon (April 2, 2003). "Your Tax Dollars at Work: Ridge Cut". The Chattanoogan. Archived from the original on June 26, 2018. Retrieved June 25, 2018.
  17. ^ "Bend Road Is Out In View Of Leech". Chattanooga Daily Times. April 15, 1958. p. 1. Retrieved December 3, 2023.
  18. ^ a b Jolley, Harmon (April 6, 2003). "Your Tax Dollars at Work: I-24 Around Moccasin Bend". The Chattanoogan. Archived from the original on September 21, 2021. Retrieved August 11, 2020.
  19. ^ a b Kovach, Bill (August 11, 1963). "State Fighting Blocks I-24". The Nashville Tennessean. p. 2B. Retrieved March 10, 2022 – via Newspapers.com.
  20. ^ Laycook, Lois (September 18, 1963). "4 Governors Agree on I-24; Campbell, Paducah on Route". The Nashville Tennessean. pp. 1, 4. Retrieved March 10, 2022 – via Newspapers.com.
  21. ^ "U.S. Offered I-24 Routing". The Nashville Tennessean. Associated Press. September 29, 1963. p. 6A. Retrieved March 10, 2022 – via Newspapers.com.
  22. ^ Laycook, Lois (August 19, 1964). "U.S. Approves I-24 to Illinois, Bridge in Dyer". The Nashville Tennessean. pp. 1, 2. Retrieved March 10, 2022 – via Newspapers.com.
  23. ^ "Eisenhower Interstate Highway System, Previous Facts of the Day". Federal Highway Administration. 2010. Archived from the original on August 8, 2020. Retrieved July 5, 2020.
  24. ^ "New Road Links Pushed in State". The Chattanooga Times. December 14, 1958. p. 10. Retrieved March 10, 2022 – via Newspapers.com.
  25. ^ Gibson, Springer (September 4, 1958). "23rd Street Freeway Work Ahead of Schedule". Chattanooga Daily Times. p. 3. Retrieved December 3, 2023.
  26. ^ Schneider, Fred (December 24, 1958). "Interstate Link On 23rd Opened". Chattanooga Daily Times. p. 3. Retrieved December 3, 2023.
  27. ^ Report of the State Highway Commissioner of Tennessee for the Biennium Ending June 30, 1960 (Report). Nashville: Tennessee Department of Highways. 1960. p. 80. Retrieved November 12, 2023 – via HathiTrust Digital Library.
  28. ^ "Program Is Set At Spring Creek". The Chattanooga Times. May 30, 1961. p. 3. Retrieved February 26, 2023 – via Newspapers.com.
  29. ^ Munck, Hal (June 1, 1961). "Spring Creek Interchange Dedicated by Road Chief". The Chattanooga Times. pp. 3, 14. Retrieved February 26, 2023 – via Newspapers.com.
  30. ^ "'$3 Million Horseshoe' Completed on U.S. Route 41 near Monteagle". The Chattanooga Times. February 25, 1962. p. 11. Retrieved March 10, 2022 – via Newspapers.com.
  31. ^ Peters, Mouzon (August 19, 1959). "$1.5 Million Freeway Job to Take at Least Another Year to Complete". The Chattanooga Times. p. 14. Retrieved March 10, 2022 – via Newspapers.com.
  32. ^ Morrell, Ken (February 6, 1962). "Monteagle Highway Opened". The Nashville Banner. pp. 1, 8. Retrieved March 10, 2022 – via Newspapers.com.
  33. ^ "One Section of Freeway Opened, Another Soon to Be (photos)". Chattanooga Daily Times. October 27, 1962. p. 3. Retrieved February 26, 2023 – via Newspapers.com.
  34. ^ "Freeway Section Is Opened (photo)". Chattanooga Daily Times. January 4, 1963. p. 1. Retrieved December 3, 2023 – via Newspapers.com.
  35. ^ "Freeways Aiding City Motorists". Chattanooga Daily Times. January 16, 1963. p. 20. Retrieved December 3, 2023 – via Newspapers.com.
  36. ^ "Second Access to I-40 Opens". The Nashville Tennessean. January 12, 1965. p. 13. Retrieved February 20, 2022 – via Newspapers.com.
  37. ^ Kovach, Bill (December 29, 1963). "Evans Bridge Handling 10,000 Cars a Day". The Nashville Tennessean. p. 8A. Retrieved July 15, 2020 – via Newspapers.com.
  38. ^ "Sections to Open on I-40, I-65". The Nashville Tennessean. April 16, 1965. p. 19. Retrieved November 15, 2021 – via Newspapers.com.
  39. ^ Caldwell, Nat (January 15, 1964). "Silliman Evans Bridge Dedicated". The Nashville Tennessean. p. 1. Retrieved March 15, 2020 – via Newspapers.com.
  40. ^ "Road to Open". The Nashville Tennessean. July 24, 1965. Retrieved March 21, 2022 – via Newspapers.com.
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  42. ^ a b c d Johnston, Louis; Williamson, Samuel H. (2023). "What Was the U.S. GDP Then?". MeasuringWorth. Retrieved November 30, 2023. United States Gross Domestic Product deflator figures follow the MeasuringWorth series.
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