Texas State Highway 5
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| Route information | ||||
| Maintained by TxDOT | ||||
| Length: | 30.6 mi (49.2 km) | |||
| Existed: | 1959 – present | |||
| Major junctions | ||||
| South end: | Exchange Pkwy in Allen | |||
 US 380 in McKinney
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| North end: |
 US 75 in Howe
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State Highway 5, or SH 5, runs along the old route of U.S. Highway 75 at Howe into the city of Allen. SH 5 parallels US 75 along its length and runs alongside the former Houston and Texas Central rail line. SH 5 was created in 1959 when the new route of US 75 was established to the west. Historically, SH 5 extended into and through Plano and Richardson.
The current version of SH 5 was established in 1959 initially as a replacement for the former routing of U.S. Highway 75 from Richardson north to McKinney when US 75 was rebuilt further to the west. The route was extended north to Howe in 1967 to replace another portion of US 75 that had been upgraded on a new route just to the west. Between 1987 and 2003, the southern terminus was moved northward as portions of the highway were returned to local cities: First, ending at SH 190 in 1987, then ending at the northern Plano city limit in 1988, and finally ending at the Exchange Parkway in Allen in 2003.
SH 5 was one of the original twenty-six state highways proposed in 1917, overlaid on top of the North Texas Highway. From 1919 the routing mostly followed present day U.S. Highway 87 from New Mexico to Amarillo. It continued on, routed along present day U.S. Highway 287 to Wichita Falls, and from there following present day U.S. Highway 82 to Texarkana.
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