Tennessee State Route 840
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| Tennessee National Guard Parkway | ||||
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| Route information | ||||
| Maintained by TDOT | ||||
| Length: | 77.28 mi (124.37 km) | |||
| Existed: | August 12, 2016 – present | |||
| Major junctions | ||||
| West end: |
 I-40 near Dickson
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| East end: |
I-40 near Lebanon
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| Location | ||||
| Counties: | Dickson, Hickman, Williamson, Rutherford, Wilson | |||
| Highway system | ||||
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| Location: | Dickson–Lebanon, TN |
| Length: | 77.28 mi (124.37 km) |
| Existed: | 1991–2016 |
Interstate 840 (I-840), formerly State Route 840 (SR 840), also designated as Tennessee National Guard Parkway, is a loop interstate highway around Nashville, Tennessee, built by the Tennessee Department of Transportation (TDOT). First proposed by former Governor Lamar Alexander as part of a system of Bicentennial Parkways, construction began in 1991 and was completed in 2012. The freeway is 77.28 miles (124.37 km) long, and it serves the cities of Lebanon, Murfreesboro, Franklin, and Dickson.
In 2015, approval was given by the Federal Highway Administration (FHWA) and the American Association of State Highway and Transportation Officials (AASHTO) to redesignate SR 840 as Interstate 840 (I-840) as part of its integration into the Interstate Highway System. On August 12, 2016, TDOT announced that it would begin re-signing the route on August 14 and that work would be complete later in the year.
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Wikipedia