Texas State Highway Spur 399

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State Highway Spur 399 marker

State Highway Spur 399
Route information
Maintained by TxDOT
Length: 1.1 mi[1] (1.8 km)
Existed: May 22, 1989[1] – present
Major junctions
West end: SH 121 / Sam Rayburn Tollway in Allen
  US 75 / SH 121 in McKinney
East end: SH 5 in McKinney
Counties: Collin
Highway system
Spur 398 Spur 400

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.

Route description[edit]

Spur 399 begins where SH 121 branches off the Sam Rayburn Tollway, to merge with the Central Expressway. After the interchange, the highway passes a few empty commercial building lots, before passing the Collin Higher Education Center to the north, and the Medical Center of McKinney to the south. The frontage roads then, depending on the direction, merge or exit the highway. The road passes a small field, before reaching its eastern terminus, an at-grade intersection with SH 5.[2][3] The freeway portion of the highway contains only one exit, for US 75 south, from the eastbound lanes, but the highway's frontage roads give access to and receive access from both directions of the Central Expressway.[4]


Exit list[edit]

The entire route is in Collin County.

Location Mile[5] km Destinations Notes
Allen 0.00 0.00 SH 121 south (Sam Rayburn Tollway) Western terminus; merges into SH 121
McKinney 0.80 1.29 US 75.svgTexas 121.svg Medical Center Drive to US 75 north / SH 121 north No signage for US 75 / SH 121 eastbound
1.20 1.93 US 75 south – Dallas Westbound exit only
1.80 2.90 SH 5 At-grade intersection, eastern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also[edit]