|Maintained by TDOT|
|Length:||7.03 mi (11.31 km)|
|Existed:||1982 – present|
|West end:||I-40 / I-75|
|East end:||I-40 / US-25W / SR-9 / I-375|
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. Interstate 375 has also done that.
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. Finally, the road was completed in anticipation of the traffic which was to be generated by the 1982 World's Fair. In 2009, a complete redesign near I-40 east of downtown added lanes, reconfigured exits, and improved safety.
Exit list 
|I-40 / I-75 south – Knoxville, Nashville, Chattanooga||Westbound exit and eastbound entrance; West end of I-75 overlap|
|1||SR-62 (Western Avenue)|
|3B||US-25W north (SR-9 north) / Gap Road – Clinton||West end of US-25W/SR-9 overlap|
|3||I-75 north / I-275 south – Knoxville, Lexington||East end of I-75 overlap|
|6||US-441 (Broadway, SR-33) / Old Broadway|
|8||Washington Pike, Mall Road South, Mall Road North, Millertown Pike|
|I-40 (US-25W south, SR-9 south) – Nashville, Asheville||Eastbound exit and westbound entrance; East end of US-25W/SR-9 overlap;Route continues beyond here as I-375 south|
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