Interstate 24
I-24 highlighted in red
Route information
Length	316.36 mi[1] (509.13 km)
Existed	August 14, 1957[2]–present
NHS	Entire route
Major junctions
West end	I-57 inPulleys Mill, IL
Major intersections	I-69 fromCalvert City, KY toEddyville, KY I-65 inNashville, TN I-40 in Nashville, TN US 41 in Nashville, TN I-59 nearWildwood, GA US 27 inChattanooga, TN
East end	I-75 /US 74 inEast Ridge, TN
Location
Country	United States
States	Illinois Kentucky Tennessee Georgia
Counties	IL:Williamson,Johnson,Massac KY:McCracken,Marshall,Livingston,Lyon,Caldwell,Trigg,Christian TN:Montgomery,Robertson,Cheatham,Davidson,Rutherford,Bedford,Coffee,Grundy,Marion,Hamilton GA:Dade
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future
←IL 23 IL →US 24 ←US 23 KY →US 25 ←SR 23  TN  →SR 24 ←SR 23 GA →SR 24 ←SR 408 GA SR 409 →SR 410

Interstate 24 (I-24) is anInterstate Highway in theMidwestern andSoutheastern United States. It runs diagonally fromI-57, 10 miles (16 km) south ofMarion, Illinois, toChattanooga, Tennessee, atI-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 throughNashville, 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 theunsigned designationState Route 409 (SR 409).

I-24 between Nashville and Chattanooga is part of a longer north–south freight corridor which runs between Chicago andAtlanta. The Interstate has facilitated the rapid growth of the largest suburban corridor in theNashville 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 theCumberland 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-percentgrade.

As proposed by theFederal-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 theFederal Highway Administration, authorized an extension of I-24 to its present-day western terminus inPulleys 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.

I-24 runs diagonally fromI-57 south ofMarion, Illinois, toI-75 atChattanooga, Tennessee. In Kentucky, the road passes throughPaducah andEddyville. 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 theunsignedState Route 409 (SR 409) designation for internalGeorgia Department of Transportation (GDOT) purposes.^[4]

I-24 begins at exit 44 onI-57 in southernWilliamson County, near the community ofPulleys Mill.^[5] The highway heads southeast into ruralJohnson County, bypassingGoreville to the east. It reaches an exit at Tunnel Hill Road, which serves Goreville andTunnel Hill. The highway continues south to its next exit atUS Route 45 (US 45) north ofVienna. It reaches its next exit atIllinois Route 146 (IL 146) in eastern Vienna. I-24 heads southeast from Vienna intoMassac County.^[6] Its first exit in Massac County is at Big Bay Road, which serves the communities ofBig Bay andNew Columbia. I-24 continues southward, bypassing the community ofRound Knob before enteringMetropolis. The highway meets US 45 again in Metropolis and passes west ofFort Massac State Park. It leaves Metropolis and crosses theI-24 Bridge over theOhio River. After that, it continues into Kentucky.^[7]

I-24 enters theJackson Purchase region of western Kentucky on a north–south alignment. Immediately withinMcCracken County, the route begins gradually veering southeast and enters the western fringes ofPaducah a few miles later. The welcome center in Paducah utilizesWhitehaven, the only historic house in the United States used as arest area.^[8] In Paducah, the Interstate continues to shift southeast and has interchanges withUS 60,US 62, andUS 45. Passing through theHendron andFarley communities adjacent to Paducah, the highway shifts into a direct east–west alignment several miles later and has an interchange withUS 68 inReidland. The route then entersMarshall County and, about seven miles (11 km) later, reaches an interchange withI-69 and a connector road to US 62 andCalvert City to the north. Here, it begins aconcurrency 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 theTennessee River onto thePennyroyal Plateau andLivingston County just north ofKentucky Dam and itsKentucky Lake impoundment. The highways then have an interchange withKentucky Route 453 (KY 453) north ofLake City andLand Between the Lakes National Recreation Area. They then cross theCumberland River about three miles (4.8 km) later intoLyon County a few miles north ofBarkley Dam andLake Barkley.^[9]

Gradually veering eastward, the two Interstates reach US 62 again nearKuttawa andEddyville. Less than two miles (3.2 km) later, I-69 splits off to the northeast at atrumpet interchange, and I-24 passes throughMineral Mound State Park, veering southeast a few miles later. Passing through a mostly wooded area, the Interstate crossesKY 93 without an interchange, and then has an interchange withKY 293 near theKentucky 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 ofCaldwell County, where it has an interchange withKY 139. The Interstate then entersTrigg 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 andKY 80 betweenCadiz andHopkinsville. The highway then crosses intoChristian 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 ofI-169 at a trumpet interchange. About four miles (6.4 km) later, the Interstate has apartial cloverleaf interchange withUS 41 Alternate, which provides access to Hopkinsville to the north andFort Campbell andClarksville, Tennessee, to the south. I-24 then crosses into Tennessee about five miles (8.0 km) later.^[9]

I-24 crosses into Tennessee from Kentucky traveling in a southeasterly-to-northwesterly direction intoMontgomery County and serving as a major means of access toSt. Louis and Chicago to the northwest. Immediately within the eastern outskirts ofClarksville, the fifth-largest city in Tennessee, the Interstate reaches an interchange withState Route 48 (SR 48), less than one mile (1.6 km) later, which provides access toTrenton in Kentucky to the north. About three miles (4.8 km) later the Interstate reachesUS 79, which also provides access toGuthrie andRussellville in Kentucky to the northeast. Bypassing Clarksville to the east, the Interstate next reachesSR 237. The highway then begins a steep descent, with the westbound lanes utilizing atruck climbing lane to ascend the grade from the east. It then crosses theRed River before reachingSR 76.

Leaving Clarksville, the highway enters a long straight section with several steep grades and crosses intoRobertson County a short distance later. Several miles later, the Interstate reaches an interchange withSR 49 nearPleasant View andCoopertown, which provides access toSpringfield to the northeast andAshland City to the southwest. The route then descends, utilizing another westbound truck lane, before briefly enteringCheatham County. The Interstate then crosses another steep hill over the next several miles, utilizing an eastbound truck lane before crossing intoDavidson County. It then has an interchange withUS 431 near theJoelton community and begins a gradual descent into theNashville Basin, containing a westbound truck lane. Passing over the next few miles through dense woodlands, the highway reachesSR 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 atSR 155 (Briley Parkway).

Entering Nashville, I-24 has acloverleaf interchange with SR 155 (Briley Parkway), a northerncontrolled-access beltway around Nashville. Less than one mile (1.6 km) later, the Interstate joins a concurrency withI-65, where the combined routes carry eight throughlanes and travel due south. About one mile (1.6 km) later is an interchange withUS 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 withUS 41, US 431, andUS 31E, and passes nearNissan Stadium. The interstate then crosses theCumberland River on theSilliman 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 towardKnoxville. 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 ofI-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) nearNashville International Airport. Beginning at the next exit,SR 255 (Harding Place), the left lanes operate ashigh-occupancy vehicle (HOV) lanes during rush hour. Over the next few miles, I-24 passes through theAntioch neighborhood, where it has interchanges with Haywood Lane andSR 254 (Bell Road), and crossesMill Creek. I-24 then continues through southeast Nashville, reaching interchanges with Hickory Hollow Parkway andSR 171 (Old Hickory Boulevard).^[10]

Continuing through the southeastern suburbs of Nashville, I-24 crosses intoRutherford County about two miles (3.2 km) beyond. Immediately within the city ofLa Vergne, the Interstate has an exit with a connector road to that city. It then entersSmyrna where it first has an interchange withSR 266 (Sam Ridley Pkwy.). The Interstate then enters a long straightaway and reaches an interchange withSR 102 (Almaville Road), which also serves Smyrna and theNissan Smyrna Assembly Plant. Leaving Smyrna, the route enters an unincorporated urban area, before reaching a three-level interchange withI-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 reachingSR 96, which also connects toFranklin. A short distance later, the Interstate crosses the west fork of theStones River and reachesSR 99 (New Salem Highway). A short distance later, the highway reachesUS 231, which also connects toLebanon andShelbyville. 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 theJoe B. Jackson Parkway, which serves as an outer beltway around southeast Murfreesboro.

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 easternHighland Rim. A few miles later, the Interstate briefly entersBedford County and then has an interchange withSR 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 entersManchester, where it crosses theLittle Duck River and then has interchanges withSR 53 andSR 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 ofArnold 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 enteringGrundy County and reaching an interchange withUS 64 andSR 50 near the town ofPelham, where it begins a concurrency with the former route that is largely unsigned. A short distance later, I-24 crosses theElk River, before reaching the base of theCumberland Plateau.

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 andMarion County near the town ofMonteagle 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 tworunaway 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 withUS 41A and US 41, respectively, and crosses intoEast 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 areI-8 through the In-Ko-Pah grade in California andI-84 through the Cabbage Hill grade east ofPendleton, 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.

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 withUS 72 nearKimball andSouth Pittsburg, where US 64 splits off. This exit is the primary means of access toHuntsville, Alabama, for motorists in East Tennessee. About three miles (4.8 km) later, the Interstate has an interchange withSR 28 inJasper and crosses theSequatchie 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 withSR 27, and, about one mile (1.6 km) later, crosses theNickajack Lake impoundment of theTennessee River. Beyond this point, the highway travels through a narrow gorge over several miles, crossing the Running Water Creek and traveling under its namesaketrestle. This stretch is extremely crooked and can experience potentially strongcrosswind. The Interstate then entersHamilton County and theEastern Time Zone and then crosses into Georgia less than one-quarter mile (400 m) later.

In the state ofGeorgia, I-24 travels for four miles (6.4 km) inDade County along the southern flank ofRaccoon 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 internalGDOT purposes.^[4] About 1.5 miles (2.4 km) after entering the state, the Interstate has an interchange with the northern terminus ofI-59, which provides access toBirmingham, Alabama, to the southwest. The route then shifts north and has an interchange withSR 299 inWildwood about one mile (1.6 km) later before turning back north and reentering Tennessee about 0.75 miles (1.21 km) later.

Upon reentering Tennessee and Hamilton County, I-24 travels throughTiftonia for several miles and has an interchange withUS 11/US 41/US 72 (Lee Highway) about three miles (4.8 km) later near theTiftonia 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 ofLookout Mountain to the south. A short distance later, the Interstate gradually curves 90 degrees to the north, enteringChattanooga. Less than one mile (1.6 km) later is a three-way interchange withUS 27 (unsignedI-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 atrumpet interchange with a connector toSR 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 ascendsMissionary 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 andEast Ridge, the Interstate has interchanges with multiple local thoroughfares over the next several miles. It then reaches its eastern terminus with I-75 at asemi-directional T interchange, known locally as the "75/24 Split" or simply "The Split".

A controlled-access highway between Nashville and Chattanooga was first included in the National Interregional Highway Committee's 1944 report, titledInterregional Highways, and a subsequent 1947 plan produced by the Public Roads Administration of the now-defunctFederal 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 theFederal-Aid Highway Act of 1956, commonly known as the Interstate Highway Act.^[15] The numbering was approved by theAmerican 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]

In 1957, officials in Tennessee,Kentucky,Illinois, andMissouri began an effort to extend I-24 west of its allocated western terminus in Nashville toSt. 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 nearDickson, before splitting off to the northwest and crossing theKentucky 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 toFort Campbell.

On September 17, 1963, the governors of the four states in a meeting with PresidentJohn F. Kennedy reached an agreement on the alignment, which included the Nashville-to-Clarksville alignment in Tennessee and extended the route's western terminus toPulleys Mill, Illinois.^[20] The four governors also urged the approval of a new east–west Interstate Highway to run betweenHayti, Missouri, andJackson, Tennessee, incorporating athen-unbuilt bridge across theMississippi River that had been proposed since the early 1940s.^[21] On August 18, 1964, the Bureau of Public Roads, the predecessor agency to theFederal 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 asI-155 and terminates inDyersburg, Tennessee.^[22][23]

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]

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 GovernorDan 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 GovernorJulian 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 the1811–1812 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, theTennessee Department of Transportation (TDOT) installed a system to detecttailgating 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 GovernorNed 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 aJersey 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 acollector–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 utilizedaccelerated bridge construction by shifting I-24 traffic onto the Germantown Road entrance and exit ramp and adjacent frontage roads.^[106]

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 roadsidedynamic-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 recommendedvariable speed limits and variable lane control signs for each lane.^[109][110] The final phase will include the installation oframp meters on certain onramps and the installation of additionalclosed-circuit television (CCTV) cameras and DMS boards andAmericans with Disabilities Act of 1990 (ADA) improvements along connecting arterials.^[108]

On July 27, 1973, astation 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 theNational 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]

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]

State	County	Location	mi[121][122][123]	km	Exit[124]	Destinations	Notes
Illinois	Williamson	Southern Precinct	0.00	0.00	—	I-57 –Chicago,Memphis	Western terminus; exit 44 on I-57
	Johnson	Tunnel Hill	7.22	11.62	7	CR 12 (Tunnel Hill Road) –Tunnel Hill,Goreville
		Bloomfield	13.64	21.95	14	US 45 –Vienna,Harrisburg
		Vienna	16.00	25.75	16	IL 146 –Vienna,Golconda
	Massac	Georges Creek Precinct	26.55	42.73	27	CR 10 (Big Bay Road) –New Columbia,Big Bay	No services
		Metropolis	37.16	59.80	37	US 45 –Metropolis,Brookport	Access toFort Massac State Park; rest area
Ohio River			38.73 0.000	62.33 0.000	Interstate 24 Bridge Illinois–Kentucky state line
Kentucky	McCracken	Paducah	2.958	4.760	3	KY 305 –Paducah
			4.328	6.965	4	I-24 BL east /US 60 –Paducah,Wickliffe	Western terminus of I-24 Bus.; access toKentucky Oaks Mall
			6.387– 6.865	10.279– 11.048	7	US 45 /US 62 –Bardwell,Mayfield
		​	11.035	17.759	11	I-24 BL west /KY 1954 (Husband Road) –Paducah	Eastern terminus of I-24 Bus.
		​	16.153	25.996	16	US 68 –Paducah
	Marshall	​	24.961	40.171	25	I-69 south –Fulton,Calvert City	Western end of I-69 concurrency; signed as exits 25A (south) and 25B (north)
		Calvert City	26.565	42.752	27	US 62 –Kentucky Dam,Calvert City
	Livingston	​	30.729	49.454	31	KY 453 –Grand Rivers,Smithland	ServesLand Between the Lakes National Recreation Area
	Lyon	Kuttawa	39.553	63.654	40	KY 93 /US 62 /US 641 –Eddyville,Kuttawa
		Eddyville	41.647	67.024	42	I-69 north /Western Kentucky Parkway (to KY 9001) –Henderson,Elizabethtown	Eastern end of I-69 concurrency; I-69 exit 68
		​	44.732	71.989	45	KY 293 –Princeton
	Caldwell	​	55.632	89.531	56	KY 139 –Princeton,Cadiz
	Trigg	Cadiz	65.313	105.111	65	US 68 /KY 80 –Cadiz,Hopkinsville	ServesLand Between the Lakes National Recreation Area
	Christian	​	72.692	116.986	73	KY 117 –Newstead,Gracey
		​	81.243	130.748	81	I-169 north –Hopkinsville	Southern terminus of I-169, formerly known as the Pennyrile Parkway; exit 1 on I-169
		Hopkinsville–Oak Grove line	85.608	137.773	86	US 41 Alt. –Hopkinsville,Fort Campbell
		Oak Grove	88.761	142.847	89	KY 115 –Oak Grove,Pembroke	Serves theJefferson Davis Monument State Historic Site
			93.373 0.00	150.269 0.00	Kentucky–Tennessee state line
Tennessee	Montgomery	Clarksville	1.61	2.59	1	SR 48 –Clarksville,Trenton
			4.51	7.26	4	US 79 (LG Highway / Wilma Rudolph Boulevard) –Clarksville,Guthrie	Access toAustin Peay State University and Tennessee College of Applied Technology at Clarksville
			7.95	12.79	8	SR 237 (Hankook Road / Rossview Road)	Access toDunbar Cave State Park
			10.61	17.08	11	SR 76 (Dr. Martin Luther King Jr. Parkway) –Clarksville,Adams	Access toPort Royal State Park
	Robertson	​	19.17	30.85	19	SR 256 (Maxey Road) –Adams
		Pleasant View–Coopertown line	24.41	39.28	24	SR 49 –Springfield,Ashland City
	Cheatham	​	31.02	49.92	31	SR 249 (New Hope Road)
	Davidson	Nashville	35.16	56.58	35	US 431 –Springfield,Joelton
			40.70	65.50	40	SR 45 (Old Hickory Boulevard)
			43.40	69.85	43	SR 155 (Briley Parkway)	SR 155 exits 18A-B; access toNashville International Airport
			44.17– 44.81	71.08– 72.11	44	I-65 –Louisville,Nashville	Western end of I-65 concurrency; signed as exits 44A (south) and exit 44B (north) eastbound; I-65 exit 88
			45.79	73.69	87	US 431 (Trinity Lane)
			46.42– 47.05	74.71– 75.72	46B	I-65 south toI-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	47	North First Street / Jefferson Street
			47.93	77.14	47A	US 31E (Ellington Parkway) / Spring Street
			48.43– 48.51	77.94– 78.07	48	James Robertson Parkway (US 31 /US 41 /US 431) –State Capitol
			48.90	78.70	49	Korean Vets Boulevard / Shelby Avenue –Nissan Stadium
			49.33– 49.93	79.39– 80.35	Silliman Evans Bridge over theCumberland River
			49.74– 50.06	80.05– 80.56	50	I-40 west toI-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
			50.42	81.14	212	Hermitage Avenue (US 70)	Westbound exit; exit number follows I-40
			50.97	82.03		Fesslers Lane	Eastbound 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 toNashville International Airport
			51.85	83.44	52	US 41 /US 70S (Murfreesboro Road)
			52.19– 53.04	83.99– 85.36	53	I-440 west –Memphis	Eastern terminus of I-440
			53.70	86.42	54	SR 155 (Briley Parkway)	SR 155 exits 3A-B
			55.71	89.66	56	SR 255 (Harding Place)	Access toNashville International Airport
			57.02	91.76	57	Haywood Lane –Antioch	Signed as exits 57A (west) and 57B (east) eastbound
			59.40	95.60	59	SR 254 (Bell Road)
			60.08	96.69	60	Hickory Hollow Parkway / William Turner Parkway
			62.54	100.65	62	SR 171 (Old Hickory Boulevard)
	Rutherford	La Vergne	64.55	103.88	64	Waldron Road –La Vergne
		Smyrna	66.30	106.70	66	SR 266 east (Sam Ridley Parkway) –Smyrna	Signed as exits 66A (west) and 66B (east) eastbound
			69.90	112.49	70	SR 102 (Nissan Drive / Lee Victory Parkway / Almaville Road) –Smyrna
		​	74.12– 75.11	119.28– 120.88	74	I-840 –Memphis,Franklin,Knoxville,Lebanon	Signed as exits 74A (west) and 74B (east); I-840 exits 53A-B; former SR 840
		Murfreesboro	76.21	122.65	76	Fortress Boulevard / Medical Center Parkway
			77.98	125.50	78	SR 96 –Franklin,Murfreesboro	Signed as exits 78A (west) and 78B (east)
			79.80	128.43	80	SR 99 –Murfreesboro
			81.23	130.73	81	US 231 –Shelbyville,Murfreesboro	Signed as exits 81A (south) and 81B (north) eastbound
			83.58	134.51	84	Joe B. Jackson Parkway	Signed as exits 84A (south) and 84B (north) eastbound
		​	88.79	142.89	89	Buchanan – Epps Mill Road
	Coffee–Bedford county line	​	96.85	155.86	97	SR 64 (Beechgrove Road) –Shelbyville
	Coffee	​	105.23	169.35	105	US 41
		Manchester	110.22	177.38	110	SR 53 –Manchester,Woodbury
			111.23	179.01	111	SR 55 –Manchester,Tullahoma,McMinnville	Signed as exits 111A (south) and 111B (north) eastbound
			113.77	183.10	114	US 41 –Manchester
		Arnold AFB	117.20	188.62	117	Arnold Air Force Base –Tullahoma
	Grundy	Pelham	127.54	205.26	127	US 64 west /SR 50 –Pelham,Winchester	West end of US 64 concurrency
		Monteagle			Rest area
	Marion–Grundy county line		134.33	216.18	134	US 41A –Monteagle,Sewanee
	Marion		135.48	218.03	135	ToUS 41 north –Monteagle,Tracy City	Western end ofSR 2 concurrency
		​	142.94	230.04	143	Martin Springs Road	Eastern end ofSR 2 concurrency
		Kimball	151.93	244.51	152	US 64 east /US 72 toUS 41 –Kimball,South Pittsburg	Eastern end of US 64 concurrency; western end of SR 27 concurrency
		Jasper	155.62	250.45	155	SR 28 –Jasper,Dunlap
		​	158.68	255.37	158	SR 27 east –Nickajack Dam,Powells Crossroads	Eastern end of SR 27 concurrency
		​	160.34– 160.94	258.04– 259.01	Interstate 24 Bridge overNickajack Lake
		Haletown	161.33	259.64	161	SR 156 –Haletown,New Hope
	Hamilton	No major junctions
			166.9 0.00	268.6 0.00	Tennessee–Georgia state line
Georgia	Dade	​	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
		​	3.55	5.71	169	SR 299 toUS 11 –Wildwood
			4.13 171.0	6.65 275.2	Georgia–Tennessee state line
Tennessee	Hamilton	Chattanooga	173.7	279.5	174	US 41 /US 64 toUS 11 –Lookout Valley,Lookout Mountain
			175.0	281.6	175	Browns 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 ofunsignedI-124
			180.0	289.7	180	US 27 south (Rossville Boulevard) toSR 8 north / Central Avenue	Eastern end of US 27 concurrency; signed as exits 180A (north) and 180B (south)
			180.9	291.1	181	Fourth Avenue
			181.4	291.9	181A	US 41 south –East Ridge	Eastbound exit and westbound entrance
			182.0	292.9	Missionary Ridge crossing
		Chattanooga–East Ridge line	183.0	294.5	183A	Belvoir Avenue / Germantown Road	Signed as exit 183 eastbound
		East Ridge	184.0	296.1	184	Moore Road
			185.2	298.1	185	I-75 (US 74 east) –Atlanta,Knoxville	Eastern 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       Concurrency terminus       Incomplete access

Interstate 124
Location	Chattanooga, Tennessee
Length	1.92 mi[125] (3.09 km)
Existed	November 12, 1958[126]–present

Interstate 124 (I-124) is anunsigned designation for a short segment of a four-lane controlled-access highway located inChattanooga, Tennessee. During periods where this two-mile-long (3.2 km) segment ofUS 27 has been signed as I-124, it has served as aspur 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 theTDOT official map no longer designates it as I-124, but some TDOT publications still make reference to the designation.^[128]

Interstate 24 Business
Location	Paducah, Kentucky
Length	11.2 mi[129] (18.0 km)
Existed	2002[citation needed]–present

Interstate 24 Business (I-24 Bus.) is an 11.2-mile (18.0 km)business loop of I-24 that travels through downtownPaducah, Kentucky, that begins at I-24 andUS 60 at exit 4 and ends at I-24 andKY 1954 at exit 11. Originally designated asInterstate 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 inMcCracken County.

Location	mi[129]	km	Destinations	Notes
Paducah	0.0	0.0	US 60 west (Hinkleville Road west) /I-24	Western terminus; western end of US 60 concurrency; I-24 exit 4
	1.9	3.1	KY 731 south (32nd Street)	Northern terminus of KY 731
	2.4	3.9	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 servesBaptist Health Paducah
	2.6	4.2	US 45 (H.C. Mathis Drive)
	4.4	7.1	US 45 Bus. north (8th Street)	Western end of US 45 Bus. concurrency
	5.2	8.4	US 45 Bus. south (Kentucky Avenue)	Eastern end of US 45 Bus. concurrency
	8.2	13.2	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-Oakdale	8.8	14.2	KY 450
	10.9	17.5	KY 2187 north (Husband Road north)	Southern terminus of KY 2187
​	11.2	18.0	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       Concurrency terminus

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