![]() ![]() Initially heading northwest, the Interstate immediately passes under State Route 169 (SR 169, Middlebrook Pike) without an interchange. Along this section, I-640 is treated as the primary route, with exits numbered according to its mileage. ![]() I-640 begins west of Downtown Knoxville at a semi-directional T interchange with I-40 and I-75, where the latter continues onto a concurrency with I-640. Unlike the other Interstate Highways in Knoxville, however, I-640 rarely experiences severe congestion. ![]() In 2022, annual average daily traffic (AADT) counts ranged from 70,244 vehicles per day at the highway's eastern terminus to 104,064 vehicles on the western leg. I-640 has three lanes in each direction for its entire length, in addition to auxiliary lanes between some interchanges. Route description I-640 westbound at SR 62 (Western Avenue) Work on the remainder of I-640 began in 1977, and the last section was completed in 1982. Initial construction work began in the early 1960s, and for many years, only two miles (3.2 km) of the highway was open to traffic. The route that is now I-640 was first planned by the city of Knoxville in 1945 and initiated by the Federal Aid Highway Act of 1956, along with most of the Interstate Highway System. Both of these highways were rerouted from their original alignments upon I-640's completion. For the rest of its length, the Interstate maintains an unsigned concurrency with U.S. įor its first 3 miles (4.8 km), I-640 has a concurrency with I-75, although exits along this segment are numbered according to the former's mileage. It has a total length of 10.80 miles (17.38 km) and runs approximately three miles (4.8 km) north of downtown through the northern neighborhoods of Knoxville. All trucks carrying hazardous cargo through Knoxville are required to use I-640. It serves as a bypass for I-40 around Downtown Knoxville and is also an alternative route for traffic passing between I-40 and I-75. Interstate 640 ( I-640) is an east–west auxiliary Interstate Highway in Knoxville, Tennessee. ![]()
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