Route information | ||||
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Maintained by TxDOT | ||||
Length | 1.1 mi[1] (1.8 km) | |||
Existed | March 2, 1989[1]–present | |||
Major junctions | ||||
West end | ![]() | |||
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East end | ![]() | |||
Location | ||||
Country | United States | |||
State | Texas | |||
Counties | Collin | |||
Highway system | ||||
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Spur 399 is a short, limited-access spur highway located in Collin County, Texas, and connects State Highway 121 (SH 121) and the US Highway 75 (US 75, Central Expressway) to SH 5, in McKinney. The highway is just over a mile long, and was originally designated in 1964, but was redesignated in 1989.