Interstate 640

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Interstate 640 marker

Interstate 640
Route information
Maintained by TDOT
Length: 10.04 mi[1] (16.16 km)
Existed: 1982 – present
Major junctions
West end: I-40 / I-75
  US 25W
I-75 / I-275
US 441
East end: I-40 / US 25W / SR 9
Highway system
SR 477 US 641

Interstate 640 (abbreviated I-640) is a bypass of Interstate 40 running north of Knoxville, Tennessee. The route serves as an alternative for traffic going east on Interstate 40 intending to turn northward on Interstate 75, which has greatly relieved congestion in downtown Knoxville.

Route description[edit]

I-640 begins at an interchange with I-40 and I-75, where I-75 continues onto I-640. Initially heading northwest, I-640 and I-75 turn northeast, intersecting SR 62 before coming to an interchange with SR 9, US 25W, I-75, and I-275. As the freeway continues, US 25W and SR 9 run concurrently for the rest of its length. I-640 interchanges with SR 33 and US 441, as well as one providing access to the East Towne Mall. The highway then turns south and terminates at I-40.[2]


For many years only about a 2 miles (3.2 km) segment between State Route 33 (Broadway/Old Broadway exit) and U.S. Highway 25W (Clinton Highway exit) was open. Then in 1981, the road was finally completed in anticipation of the traffic which was to be generated by the 1982 World's Fair. Then Governor of Tennessee, now United States Senator Lamar Alexander officially opened the road by walking its entire length dressed in his famous red plaid shirts that he famously wore during his both of his campaigns for Governor of Tennessee. In May 2008, a complete redesign near I-40 east of downtown added lanes, reconfigured exits, and improved safety closed that section of I-40 for 13 months. The road construction project was officially called Smart Fix 40, and the Tennessee Department of Transportation closed that section of I-40 until June 2009, when it was officially completed 18 days early. During the course of the Smart Fix 40 construction project, the Tennessee Department of Transportation used I-640 as the official detour route for I-40 traffic during the time in which I-40 was closed for the reconfiguration.[3]

Exit list[edit]

The entire route is in Knoxville, Knox County.

mi km Exit Destinations Notes
0.0 0.0 I-40 / I-75 south – Knoxville, Nashville, Chattanooga Westbound exit and eastbound entrance; western end of I-75 overlap; I-40/75 exit 385; western terminus
0.6 0.97 1 SR 62 (Western Avenue)
2.3 3.7 3B To US 25W north (SR-9 north) / Gap Road – Clinton Eastbound exit only
3 4.8 3B US 25W north (SR-9 north) – Clinton Westbound exit and both entrances; western end of US-25W/SR-9 overlap
2.9 4.7 3 I-75 north / I-275 south – Knoxville, Lexington Signed as Exit 3A westbound; Eastern end of I-75 overlap
5.4 8.7 6 US 441 (Broadway, SR-33) / Old Broadway Old Broadway signed eastbound only
7.6 12.2 8 Washington Pike, Mall Road South, Mall Road North, Millertown Pike
10.1 16.3 I-40 / US 25W south (SR-9 south) – Nashville, Asheville Eastbound exit and westbound entrance; East end of US-25W/SR-9 overlap; US-25W/TN 9 unsigned (follows I-40 east); I-40 exit 393; eastern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


Route map: Google

KML is from Wikidata