Wikipedia

Interstate 40

"I-40" redirects here. For other uses, seeI-40 (disambiguation).

Interstate 40(I-40) is a major east–west transcontinentalInterstate Highwayin thesoutheasternandsouthwesternportions of the United States. At a length of 2,556.61 miles (4,114.46 km), it is the third-longest Interstate Highway in the country, afterI-90andI-80.From west to east, it passes throughCalifornia,Arizona,New Mexico,Texas,Oklahoma,Arkansas,Tennessee,andNorth Carolina.Its western terminus is atI-15inBarstow, California,while its eastern terminus is at aconcurrencywithU.S. Route 117(US 117) andNorth Carolina Highway 132(NC 132) inWilmington, North Carolina.Major cities served by the interstate includeFlagstaff, Arizona;Albuquerque, New Mexico;Amarillo, Texas;Oklahoma City, Oklahoma;Little Rock, Arkansas;Memphis,Nashville,andKnoxvillein Tennessee; andAsheville,Winston-Salem,Greensboro,Durham,Raleigh,and Wilmington in North Carolina.

Interstate 40 marker
Interstate 40
Map
Route information
Length2,556.61 mi[1](4,114.46 km)
ExistedAugust 14, 1957[2]–present
NHSEntire route
Major junctions
West endI-15inBarstow, CA
Major intersections
East endUS 117inWilmington, NC
Location
CountryUnited States
StatesCalifornia,Arizona,New Mexico,Texas,Oklahoma,Arkansas,Tennessee,North Carolina
Highway system

I-40 begins in theMojave Desertin California, and then proceeds through theColorado Plateauin Arizona and the southern tip of theRocky Mountainsin New Mexico. It then traverses theGreat Plainsthrough theTexas Panhandleand Oklahoma, and passes south of theOzarksin Arkansas. The freeway crosses theAppalachian Mountainsin Tennessee and North Carolina, before terminating in theAtlantic Coastal Plainnear theAtlantic Ocean.

Much of the western part of I-40, from Barstow toOklahoma City,parallels or overlays the historicU.S. Route 66.East of Oklahoma City, the route generally parallelsUS 64andUS 70.I-40 was established by theFederal-Aid Highway Act of 1956,and the numbering was subsequently approved on August 14, 1957, along with most of the rest of the system. The eastern terminus was initially planned to be located atI-85in Greensboro, but theFederal Highway Administrationlater approved extending the route to its current eastern terminus in Wilmington. As a result, this was the last segment of I-40 to be completed upon its dedication in 1990.

Route description

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Lengths
mi[1] km
CA 154.61 248.82
AZ 359.48 578.53
NM 373.51 601.11
TX 177.10 285.01
OK 331.73 533.87
AR 284.69 458.16
TN 455.28 732.70
NC 420.21 676.26
Total 2,556.61 4,114.46

I-40 is the third-longest freeway in the United States, spanning 2,556.61 miles (4,114.46 km) across the southern half of the country. The longest stretch of the highway is in Tennessee, and the shortest is in California. The busiest stretch of I-40 is in Knoxville, concurrent withI-75,which has anannual average daily trafficvolume of more than 210,000 vehicles.[3]The lowest traffic volumes are found on rural stretches in New Mexico, Texas, and Oklahoma, where the freeway carries fewer than 15,000 vehicles per day.[4][5][6]

California

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A sign at the start of I-40 in Barstow, California, showing the distance to the freeway's eastern terminus in Wilmington, North Carolina. This sign has been stolen several times.
Main article:Interstate 40 in California

I-40 in California crosses through the lightly populated northern part of theInland Empireregion of the state. Its western end is inBarstow, California.Known as the Needles Freeway, it heads east from Barstow across theMojave DesertinSan Bernardino CountytoNeedles,before it crosses theColorado RiverintoArizonasouthwest ofKingman.I-40 covers 155 miles (249 km) in California. Some signs show thecontrol cityfor I-40 westbound to beLos Angeles,where drivers would followI-15south from its western terminus in Barstow. The highway is four lanes for the entirety of its length in the state.

A sign in California showing the distance toWilmington, North Carolina,has been stolen several times.[7]

Arizona

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I-40 westbound heading toward Flagstaff
Main article:Interstate 40 in Arizona

I-40 is a main route to the South Rim of theGrand Canyon,with the exits leading intoGrand Canyon National ParkinWilliamsand Flagstaff. I-40 covers 359 miles (578 km) in Arizona. Just west of exit 190, west of Flagstaff, is its highest elevation along I-40 in the US, as the road crosses just over 7,330 feet (2,230 m) at the Arizona Divide near milepost 190. I-40 also passes through theNavajo Nation,the largest Indian reservation in the US. Like California's segment, the highway is four lanes for the entirety of its length in the state.

New Mexico

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Main article:Interstate 40 in New Mexico

I-40 covers 374 miles (602 km) in New Mexico. As in other states it parallels or overrides the post 1937 Route 66 route through the state. Notable cities along I-40 includeGallup,Grants,Albuquerque,Santa Rosa,andTucumcari.I-40 also travels through severalIndian reservationsin the western half of the state. It reaches its highest point in the state of 7,275 feet (2,217 m) at the Continental Divide (Campbell Pass) in western New Mexico between Gallup and Grants. The last place that I-40 tops 7,000 feet (2,100 m) is at the head of Tijeras Canyon east of Albuquerque at approximately 7,040 feet (2,150 m).

Arizona, New Mexico, Texas, Oklahoma, and Arkansas are the five states where I-40 has a speed limit of 75 mph (121 km/h) instead of the 70 mph (110 km/h) limit in California, Tennessee, and North Carolina.[8][9]

Texas

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An at-grade intersection on I-40 in Texas, 2003
Main article:Interstate 40 in Texas

In the westTexas panhandlearea, there are several ranch roads connected directly to the Interstate. The only major city in Texas that is directly served by I-40 isAmarillo,which connects withI-27that runs south towardLubbock.I-40 also connects toUS 287that runs southeast to Dallas–Fort Worth andUS 87/US 287 north to Dumas and then on into Oklahoma. I-40 has only one welcome center in the state, which is located in Amarillo at the exit forRick Husband Amarillo International Airport,serving both sides of the Interstate.

Oklahoma

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Main article:Interstate 40 in Oklahoma

I-40 goes through the heart of the state, passing through many Oklahoma cities and towns, includingErick,Sayre,Elk City,Clinton,Weatherford,El Reno,Yukon,Oklahoma City,Del City,Midwest City,Shawnee,Okemah,Henryetta,Checotah,Sallisaw,andRoland.I-40 covers 331 miles (533 km) in Oklahoma.

InDowntown Oklahoma City,I-40 was rerouted one mile (1.6 km) south of its former alignment and a 10-lane (five in each direction) facility replaced the formerI-40 Crosstown Bridge;the former I-40 alignment will be replaced with an urban boulevard currently designated as Oklahoma City Boulevard.

Arkansas

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TheHernando de Soto Bridge,where I-40 crosses theMississippi RiverintoMemphis
Main article:Interstate 40 in Arkansas

I-40 enters the west-central part of the state and runs for 285 miles (459 km) in Arkansas. The route passes throughVan Buren,where it intersects the southboundI-540/US 71toFort Smith.[10]The route continues east toAlmato intersectI-49north toFayetteville, Arkansas.Running through theOzark Mountains,I-40 servesOzark,Clarksville,Russellville,Morrilton,andConway.The route turns south after Conway and entersNorth Little Rock,which brings high volume interchanges withI-430,I-30/US 65/US 67/US 167,andI-440/Highway 440(AR 440).[11]The Interstate continues east throughLonoke,Brinkley,andWest Memphison the eastside. I-40 briefly overlapsI-55in West Memphis before it crosses theMississippi Riveron theHernando de Soto Bridgeand entersMemphis, Tennessee.[12]

Tennessee

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Main article:Interstate 40 in Tennessee
I-40 inNashville

The State of Tennessee has the longest segment of I-40 at 455 miles (732 km). The Interstate goes through all of the threeGrand Divisions of Tennesseeand its three largest cities:Memphis,Nashville,andKnoxville.Jackson,Lebanon,Cookeville,Crossville,andNewportare other notable cities through which I-40 passes. Before leaving the state, I-40 enters theGreat Smoky MountainstowardNorth Carolina.

The section of I-40 which runs between Memphis and Nashville is often referred to as theMusic Highway.[13]During reconstruction, a short section of I-40 through downtown Knoxville near the centralMalfunction Junctionwas completely closed to traffic from May 1, 2008, and not reopened until June 12, 2009, with all traffic redirected viaI-640,the northern bypass route. The redesigned section now has additional lanes in each direction, is less congested, and has fewer accidents.[14][15]

North Carolina

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A sign displaying the distance to Barstow near Wilmington. This sign is no longer posted by NCDOT due to the frequency of its theft.[16]
The beginning of I-40 west, near Wilmington
Main article:Interstate 40 in North Carolina

InNorth Carolina,I-40 travels 420 miles (680 km). It enters the state as a winding mountain freeway through theGreat Smoky Mountains,which frequently closes due to landslides and weather conditions. It enters the state on a mostly north–south alignment, turning to a more east–west alignment upon merging withUS 74at the eastern terminus of theGreat Smoky Mountains Expressway.From there, the highway passes throughAsheville,Hickory,andStatesvillebefore reaching thePiedmont Triad.Just east of the Triad City ofGreensboro, North Carolina,it merges withI-85,and the two roads split again just west of theResearch Trianglearea, passing throughDurhamandRaleigh.From the Triangle to its eastern terminus inWilmington,it once again takes a more north–south alignment.

A standard distance sign existed near the start of the westbound section of I-40 in Wilmington that indicated the distance to Barstow, California, as 2,554 miles (4,110 km). In 2009, NCDOT said it would not be replaced afterfrequent thefts.[17]

History

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Predecessors and planning

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A monument toBeale's Wagon RoadinKingman, Arizona

During thecolonialandwestward expansioneras, a number ofNative Americantrails existed within the vicinity of what is now Interstate 40. In 1857, an expedition led by Edward Fitzgerald Beale was tasked with establishing a trade route along the35th parallel northfromFort Smith, Arkansas,toLos Angeles.This route, which became known asBeale's Wagon Road,was constructed by a team of about 100 men and 22 camels led by Lt.Edward Fitzgerald Beale.Completed in 1859, it is generally considered the first federal highway in the Southwestern United States.[18]

In the early 20th century, a number ofauto trailswere established by private organizations to aid motorists in traveling between major cities. Among these was theNational Old Trails Road,which roughly followed the western part of present-day I-40 to Albuquerque, and theLee Highway,which followed much of the eastern portion of the route.[19]When the state governments established theUnited States Numbered Highway Systemin 1926, two of these most important highways,US 66andUS 70were established within the present-day I-40 corridor.[20]

US 66, which followed the route from its western terminus to Oklahoma City, became arguably the most famous highway in the United States and has been recognized multiple times in popular culture.[21]US 70, which roughly follows the remainder of the Interstate, was also one of the most important highways for east−west travelers, and was considered part of the "Broadway of America" highway between California andNew York.[22]

An east−west trans-continental freeway to serve the south-central United States was proposed in multiple plans throughout the 1930s and 1940s for what later became theInterstate Highway System.[23]The general alignment for the highway that became I-40 was included in a plan released on August 2, 1947, by the Public Roads Administration of the now-defunctFederal Works Agency.[24]The Interstate was officially authorized between Barstow and Greensboro by theFederal-Aid Highway Act of 1956,which created the Interstate Highway System. The numbering was subsequently approved by theAmerican Association of State Highway Officials(AASHO) on August 14, 1957, along with most of the system.[2]

In 1957, the California Department of Highways, the predecessor agency to theCalifornia Department of Transportation(Caltrans), proposed that the route be renumbered toI-30instead because of the already existingUS 40in the state. This route was decommissioned in the state in 1964 as a part of a major revamping of California's overall highway numbering system.[25]The California state government also submittedState Route 58(SR 58) betweenBarstowandBakersfieldfor I-40 extension potential in 1956 and 1968, but both of these requests were rejected.[26]

From 1963 to 1966, the US government considered a plan, part ofProject Plowshare,to use atomic bombs to excavate a path for I-40 through California. The project was canceled largely due to the cost of developing the explosives and due to the unavailability of a "clean bomb".[27]

Construction

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The first sections of I-40 reused freeways that had been constructed prior to the Interstate Highway System or were under construction at the time of the authorization of the system. The first stretch in Tennessee reused a short freeway in Knoxville called the Magnolia Avenue Expressway, which was opened in two segments in 1952 and 1955. The first stretches in North Carolina were a short controlled-access sections ofUS 421in Winston-Salem, and fromKernersville,constructed between 1955 and 1958. By 1957, most states had begun construction on the first sections of I-40. The stretch between Memphis and Nashville, completed on July 24, 1966, was the first major stretch of interstate highway completed in Tennessee.[28]

On June 30, 1972, the final stretch of I-40 entirely within Arkansas, located betweenClarksvilleandOzarkwas opened;[29]the last section to open in the state was theHernando de Soto Bridge,which opened on August 2, 1973.[30][31]The last segment in California to be completed was a short stretch in Needles, opened on August 13, 1973.[32][33]The last original planned stretch of the highway in Tennessee, located east of Knoxville, was partially opened on December 20, 1974,[34]and fully opened on September 12, 1975.[35]The last section of I-40 in Oklahoma, a 17-mile (27 km) stretch nearEricknear the western end of the state, opened on June 2, 1975.[36][37]

In 1971, the North Carolina State Highway Commission approved a plan to extend I-40 fromResearch Triangle ParktoI-95,a distance of 41 miles (66 km), at a cost of $75 million (equivalent to $432.36 million in 2023[38]). Most of the highway would be four lanes, though six lanes were likely nearRaleigh,where I-40 would extend theBeltline.Several routes were being considered, but, at the time, the most likely route would have ended north ofSmithfield.[39]When the last portion of I-40, connecting Wilmington to Raleigh, was dedicated on June 29, 1990, CBS journalistCharles Kuraltstated:

Thanks to the Interstate Highway System, it is now possible to travel from coast to coast without seeing anything.[40][41]

Controversies

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InMemphis,I-40 was originally planned to pass through the city'sOverton Park,a 342-acre (138 ha) public park. Following a public announcement of the routing, a group of community activists opposed to the routing founded an organization calledCitizens to Preserve Overton Parkin 1957, and collected 10,000 signatures in their support.[42]After Secretary of TransportationJohn Volpeauthorized the state to solicit bids for the construction of the interstate through the park in 1969, the organization filed a lawsuit, which culminated in thelandmarkSupreme Courtruling ofCitizens to Preserve Overton Park v. Volpein 1971, which ruled that the state highway department had not adequately explored alternative routes for the interstate.[43]This case is considered to have established the modern process ofjudicial reviewof infrastructural projects, and eventually resulted in the state rerouting the alignment of I-40 through the park onto a section of I-240 in 1981.[42][44]

Major projects

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Between May 1980 and March 1982, a major project was conducted on I-40 in Knoxville that widened the route, eliminated several interchanges, added frontage roads, and reconstructed the congestion-prone cloverleaf interchange with I-75, which had earned the nickname "Malfunction Junction", into a three-level stack interchange.[45][46]This was conducted as part of a larger $250 million (equivalent to $668 million in 2023[38]) road improvement project in the Knoxville area in preparation for the1982 World's Fair.[47][48]

Originally, I-40 was constructed through downtownWinston-Salem,and it continued to follow that route until a new urban bypass route was built. After the bypass was completed around 1992, I-40 was relocated to the new freeway. The old highway was then redesignated asInterstate 40 Business(I-40 Bus.), establishing a business route that was actually an expressway for its entire length, a rarity among business routes. Following a reconstruction, the expressway was renamedSalem Parkwayand redesignated as part ofUS 421.

The "Big I"interchange in Albuquerque between I-40 and I-25 was reconstructed between 2000 and 2002 in a project that eliminated left-hand entrance ramps and added lanes. This project was given an honorable mention by theUnited States Department of Transportationand the FHWA for excellence in urban highway design in 2002.[49]

TheOklahoma City Crosstown Expresswaywas relocated and replaced with a new wider alignment in two phases between May 2002 and October 2012. The old alignment was replaced withOklahoma City Boulevard,and at-grade thoroughfare.[50]

In Memphis, the cancellation of the Overton Park stretch of I-240, along with increased traffic volumes and safety hazards, rendered both interchanges with I-240 unable to effectively handle unplanned traffic patterns, thus necessitating their reconstruction. This was accomplished in three phases between January 2001 and December 2016.[51][52][53][54]

A $203.7 million two-phase project dubbed "SmartFix 40" resulted in a complete closure of a short stretch of I-40 through Knoxville between May 1, 2008, and June 12, 2009.[55]This was done in order to accelerate the construction timeline, and during this time, through traffic was required to useI-640.[56]Both phases of the project won an America's Transportation Award from AASHTO in 2008 and 2010, respectively.[57][58]

Geological difficulties

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Landslides are common in the Pigeon River Gorge section along the Tennessee and North Carolina border. Here, the roadway was cut into the slopes of several steep mountains. Accidents on the winding road are also common especially during bad weather. On October 25, 2009, I-40 was closed at the North Carolina and Tennessee border due to a landslide at milemarker 2.6 just east of the Tennessee state line. All traffic was detoured via I-26 and I-81, and non-heavy-load traffic via US 25 and US 70.[59]The roadway was reopened on April 25, 2010, with some remaining limitations on westbound traffic.[60]

Major incidents

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The collapsed section of the I-40 bridge, May 31, 2002

On December 23, 1988, atanker truckhauling liquefied propaneoverturned on a ramp in the interchange between I-40 and I-240in theMidtownneighborhood of Memphis, rupturing a small hole in the front of the tank.[61][62]The leaking gas ignited in a massive fireball, and the tank was propelled 125 yards (114 m) from the crash site into a nearby duplex apartment.[63]The incident killed six motorists and three occupants of nearby structures, and provided momentum for the eventual reconstruction of the interchange.[64][54]

TheI-40 bridge disasteroccurred on May 26, 2002, when a barge collided with a bridge foundation member nearWebbers Falls, Oklahoma,causing a 580-foot (180 m) section of the I-40 bridge to plunge into theArkansas River.Automobiles and semitrailers fell into the water, killing 14 people.

On May 11, 2021, theHernando de Soto Bridgecarrying I-40 over the Mississippi River was closed when inspectors discovered a crack on a tie girder.[65]A subsequent investigation revealed that the crack had existed since at least May 2019, and reports later surfaced that the crack had likely existed since August 2016.[66][67]An emergency contract to repair the beam was awarded six days after the closure,[68][69]and the bridge reopened on July 31, 2021, to eastbound traffic,[70]and to westbound traffic on August 2, 2021.[71]

The highway was badly damaged duringHurricane Helenein September 2024, with the road closed in multiple locations across western North Carolina due to landslides.[72]The worst damage was seen near North Carolina's border with Tennessee, where a large portion of the highway was washed into thePigeon Riverfollowing a mudslide, resulting in it being indefinitely closed in both directions.[73][74]On November 5, it was announced that the highway could reopen as early as the beginning of 2025.[75]

Major junctions

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California
I-15inBarstow
US 95west-northwest ofNeedles.The highways travel concurrently to Needles.
Arizona
Future I-11/US 93inKingman.The highways travel concurrently to east-northeast of Kingman.
I-17inFlagstaff
US 89/US 180in Flagstaff. I-40/US 180 travels concurrently toHolbrook.
US 191inChambers.The highways travel concurrently toSanders.
New Mexico
US 491inGallup
I-25/US 85inAlbuquerque
US 285inClines Corners
US 84west-northwest ofSanta Rosa.The highways travel concurrently to Santa Rosa.
US 54in Santa Rosa. The highways travel concurrently toTucumcari.
Texas
US 385inVega
I-27/US 60/US 87/US 287inAmarillo.I-40/US 287 travels concurrently through Amarillo.
US 83inShamrock
Oklahoma
US 283inSayre
US 183inClinton
US 281inHinton
US 270west ofEl Reno.The highways travel concurrently to northwest ofShawnee.
US 81in El Reno
I-44inOklahoma City
I-35/I-235/US 62/US 77in Oklahoma City. I-35/I-40/US 62 travels concurrently through Oklahoma City.
I-240in Oklahoma City
US 177/US 270northwest of Shawnee
US 377south-southeast ofPrague
US 62inOkemah.The highways travel concurrently toHenryetta.
US 75northeast ofClearview.The highways travel concurrently to Henryetta.
US 69southwest ofChecotah
US 266inWarner
US 59inSallisaw
US 64in Sallisaw
US 64inRoland
Arkansas
I-540/US 71inVan Buren.I-40/US 71 travels concurrently toAlma.
I-49in Alma
US 64inClarksville
US 64inLamar
US 64inLondon
US 65inConway.The highways travel concurrently toNorth Little Rock.
US 64in Conway
I-430in North Little Rock
I-30/I-57/US 65/US 67/US 167in North Little Rock. I-40/US 67/US 167 travels concurrently through North Little Rock.
I-440in North Little Rock
US 63inHazen.The highways travel concurrently toWest Memphis.
US 49inBrinkley
US 79south ofJennette.The highways travel concurrently to West Memphis.
I-55/US 61/US 63/US 64in West Memphis. I-40/I-55/US 61/US 64 travels concurrently through West Memphis.
Tennessee
US 51inMemphis
I-69/I-240in Memphis. I-40/I-69 travels concurrently through Memphis.
US 64/US 70/US 79in Memphis
US 64on the Memphis–Bartlettcity line
I-269inArlington
US 70east ofBrownsville
US 412inJackson.The highways travel concurrently to northeast of Jackson.
US 45in Jackson
US 70/US 412northeast of Jackson
US 641southeast ofHolladay
I-840southeast ofBurns
US 70SinNashville
US 70in Nashville
SR 155in Nashville
I-440in Nashville
I-65in Nashville. The highways travel concurrently through Nashville.
US 70in Nashville
US 70/US 70S/US 431in Nashville
US 31A/US 41Ain Nashville
I-24in Nashville. The highways travel concurrently through Nashville.
I-840inLebanon
US 231inLebanon
US 70in Lebanon
SR 111inCookeville
US 70Nin Cookeville
US 70NinMonterey
US 127inCrossville
US 27inHarriman
US 321inLenoir City
I-75west ofFarragut.The highways travel concurrently toKnoxville.
I-140in Knoxville
US 11/US 70in Knoxville
I-75/I-640in Knoxville
US 129in Knoxville
I-275in Knoxville
US 441in Knoxville
US 11Win Knoxville
I-640/US 25Win Knoxville. I-40/US 25W travels concurrently through Knoxville.
US 11E/US 25W/US 70in Knoxville
US 25W/US 70west ofDandridge
I-81north-northeast of Dandridge
US 25W/US 70/US 411inNewport
US 321in Newport
North Carolina
US 276inCove Creek
US 74north-northwest ofClyde.The highways travel concurrently toAsheville.
US 19/US 23in Asheville
I-26/I-240/US 74in Asheville
US 25in Asheville
I-240in Asheville
US 70inBlack Mountain.The highways travel concurrently to southwest ofOld Fort.
US 221southeast ofWest Marion
US 64inMorganton
US 321inHickory
US 64inStatesville
US 21in Statesville
I-77in Statesville
US 64in Statesville
US 64east-northeast of Statesville
US 64west-northwest ofMocksville
US 601in Mocksville
US 421inWinston-Salem
US 158in Winston-Salem
US 52/I-285in Winston-Salem
I-74in Winston-Salem
US 421west ofGreensboro.The highways travel concurrently to Greensboro.
I-73/US 421/I-840in Greensboro
US 220in Greensboro. The highways travel concurrently through Greensboro.
US 29/US 70in Greensboro. The highways travel concurrently through Greensboro.
I-85/I-840/I-785in Greensboro. I-40/I-85 travels concurrently to southwest ofHillsborough.
US 15/US 501inDurham
I-885in Durham
I-540in Durham
I-440/US 1/US 64inRaleigh.I-40/US 64 travels concurrently through Raleigh.
US 70/US 401in Raleigh
I-87/I-440/US 64in Raleigh
US 70inGarner.The highways travel concurrently to west-southwest ofClayton.
I-42/US 70near Clayton.
I-95inBenson
US 701south-southeast ofNewton Grove
US 117south-southeast ofWarsaw
US 117east-southeast ofWillard
I-140inMurraysville
US 117on theKings Grant–Murraysville CDP line

[76]

Auxiliary routes

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In Oklahoma City, the designation I-440 had been given to a stretch of Interstate Highway from I-240 to US 66. It was a part of Grand Boulevard that had been built in compliance withInterstate Highway standards.In 1982, as part of Oklahoma's "Diamond Jubilee", I-44's western terminus was moved from the I-35/I-44 junction to the Texas–Oklahoma state line via the Belle Isle Freeway (connecting I-440 with I-35); I-440, the H. E. Bailey Turnpike; and the turnpike connector road on the eastern edge ofLawton, Oklahoma.The I-440 number was dropped at the time.

Business routes

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See also:Business routes of Interstate 40

See also

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References

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  1. ^abStarks, Edward (May 6, 2019)."Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2018".Federal Highway Administration.RetrievedOctober 22,2021.
  2. ^abAmerican Association of State Highway Officials(August 14, 1957).Official Route Numbering for the National System of Interstate and Defense Highways(Map). Scale not given. Washington, DC: American Association of State Highway Officials.RetrievedMarch 27,2017– viaWikimedia Commons.
  3. ^Tennessee Department of Transportation."Transportation Data Management System".ms2soft.MS2.RetrievedNovember 27,2021.
  4. ^Tamara P. Haas (October 10, 2017).Traffic Counts New Mexico Interstates(PDF)(Report). New Mexico Department of Transportation.RetrievedJanuary 7,2023.
  5. ^Texas Department of Transportation."TPP District Traffic Web Viewer".ArcGIS.Esri.RetrievedJanuary 7,2023.
  6. ^Oklahoma Department of Transportation."AADT Traffic Counts".ArcGIS.Esri.RetrievedJanuary 7,2023.
  7. ^"I-40 Barstow, Calif., sign gone for good".StarNewsOnline.November 12, 2009. Archived fromthe originalon October 1, 2020.RetrievedOctober 20,2020.
  8. ^"Speed limit on much of I-40, I-35 raised to 75 MPH".August 4, 2020.
  9. ^"Speed limit on I-40 in the River Valley increases to 75 MPH".August 6, 2020.
  10. ^Planning and Research Division (2011).General Highway Map, Crawford County, Arkansas(PDF)(Map). 1:62,500. Little Rock: Arkansas State Highway and Transportation Department. Archived fromthe original(PDF)on February 26, 2012.RetrievedNovember 15,2011.
  11. ^Planning and Research Division (2009).General Highway Map, Pulaski County, Arkansas(PDF)(Map). 1:62,500. Little Rock: Arkansas State Highway and Transportation Department. Archived fromthe original(PDF)on July 7, 2011.RetrievedNovember 15,2011.
  12. ^Planning and Research Division (2009).General Highway Map, Crittenden County, Arkansas(PDF)(Map). 1:62,500. Little Rock: Arkansas State Highway and Transportation Department. Archived fromthe original(PDF)on February 26, 2012.RetrievedNovember 15,2011.
  13. ^Tennessee public acts 2001 Chapter 100, Senate Bill 916 House Bill 616 Signed into law April 18, 2001,http:// tennessee.gov/sos/acts/102/pub/pc0100.pdfArchivedFebruary 10, 2009, at theWayback Machine
  14. ^Tennessee Department of Transportation."SmartFix: I-40/James White Parkway/Hall of Fame Drive".Tennessee Department of Transportation. Archived fromthe originalon December 31, 2010.
  15. ^Tennessee Department of Transportation."SmartFix: I-40/James White Parkway/Hall of Fame Drive".Tennessee Department of Transportation. Archived fromthe originalon April 29, 2009.
  16. ^Star News Staff Reports."I-40 Barstow, Calif., sign gone for good".StarNews Online.StarNews. Archived fromthe originalon October 18, 2021.RetrievedOctober 15,2020.
  17. ^"I-40 Barstow, Calif., sign gone for good".Star News Online.Wilmington, North Carolina. November 12, 2009. Archived fromthe originalon August 14, 2021.RetrievedMay 10,2023.
  18. ^Weiser-Alexander, Kathy (2021)."Beale's Wagon Road From Arkansas to California".Legends of America.RetrievedJanuary 15,2023.[self-published source]
  19. ^Rand McNally (1926).Auto Road Atlas(Map). Chicago: Rand McNally.Archivedfrom the original on April 27, 2012.RetrievedApril 15,2012– via Broer Maps Online.
  20. ^Weingroff, Richard F."From Names to Numbers: The Origins of the U.S. Numbered Highway System".Highway History.Federal Highway Administration.Archivedfrom the original on September 1, 2019.RetrievedDecember 9,2021.
  21. ^"Route 66 Overview".National Park Service. June 27, 2022.RetrievedJanuary 15,2023.
  22. ^"Plan To Spend $8,000,000 On Route 1, Tennessee's Broadway of America".Johnson City Chronicle.August 18, 1928. p. 9.RetrievedFebruary 10,2021– viaNewspapers.
  23. ^Pfeiffer, David A. (Summer 2006)."Ike's Interstates at 50".Prologue.pp.14–18.ISSN0033-1031.Archivedfrom the original on March 2, 2011.RetrievedApril 11,2022.
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