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|direction_b=North |terminus_b= at the KY line |counties=Shelby, Tipton, Lauderdale, Dyer, Obion |previous_type=TN |previous_route=2 |next_type=TN |next_route=4 }} 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.〔Tennessee Department of Transportation (24 January 2003). "State Highway and Interstate List 2003"〕 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.〔 ==Route description== 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. This highway crosses four interstate highways on its journey through the state and actually crosses Interstate 240 twice within the City of Memphis but interchanges with it only at Union Avenue. US 51 is the westernmost south–north United States Highway in the State of Tennessee. US 51 is an interstate standard facility〔 from Dyersburg to South of Troy and then resuming interstate standard status north of Union City to South Fulton. US 51 is a four-lane or larger facility throughout the state with some sections north of Dyersburg carrying a speed limit. Near Henning is also the site of the Hatchie River Bridge collapse on April 1, 1989 that killed 8 motorists when 3 spans of the structure collapsed. The 54-year-old bridge was north of Memphis and carried the northbound lanes of US 51. Its collapse was the result of pier scour and movement of the river channel.〔(Haestad Methods, Inc., 13.9 Lateral Scour-The Hatchie River Bridge Failure )〕〔(National Transportation Safety Board; July 24, 1990 Letter to Gov. Ned McWherter )〕 US 51 carries the Tennessee Scenic Parkway designation from its junction with SR 385 in Millington to SR 104 in Dyersburg and also carries the Great River Road designation from US 64/US 70/US 79 in Memphis to SR 88 in Halls.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「U.S. Route 51 in Tennessee」の詳細全文を読む スポンサード リンク
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