Tennessee State Route 3
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| State Route 3 | ||||
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| Route information | ||||
| Maintained by TDOT | ||||
| Length: | 135.90 mi (218.71 km) | |||
| Major junctions | ||||
| South end: |
 US 51 at the MS line |
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| North end: |
 US 51 / Purchase Parkway at the KY line |
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| Location | ||||
| Counties: | Shelby, Tipton, Lauderdale, Dyer, Obion | |||
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U.S. Route 51, mostly overlapped by the unsigned State Route 3 (SR 3), is a north–south state highway in the U.S. state of Tennessee, that is 135.9 miles (218.71 km) long. It begins in Shelby County and ends in Obion County. The SR 3 designation is seen largely on mileposts.
The two places where US 51 and SR 3 differ are in Memphis, where US 51 has been moved to Danny Thomas Boulevard (State Route 1 / State Route 4), while SR 3 remains on the one-way pair of 2nd and 3rd Streets, and in South Fulton, where US 51 crosses the state line on State Route 215 to the Purchase Parkway, while SR 3 remains on the old road, now U.S. Route 45.
US 51 enters Tennessee at Memphis and runs north through the cities of Millington, Munford, Atoka, Brighton, Covington, Henning, Ripley, Halls, Dyersburg, Troy, Union City, and South Fulton.
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