Texas State Highway Spur 399
|Maintained by TxDOT|
|Length:||1.1 mi (1.8 km)|
|Existed:||May 22, 1989 – present|
|West end:||SH 121 / Sam Rayburn Tollway in Allen|
|US 75 / SH 121 in McKinney|
|East end:||SH 5 in McKinney|
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.
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. 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.
|This section is empty. You can help by adding to it. (March 2013)|
The entire route is in Collin County.
|Allen||0.00||0.00||SH 121 south (Sam Rayburn Tollway)||Western terminus; merges into SH 121|
|McKinney||0.80||1.29||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
- Transportation Planning and Programming Division. "Highway Designation File: State Highway Spur No. 399". Texas Department of Transportation. Retrieved March 29, 2012.
- Staff. "NTTA: Projects - Sam Rayburn Tollway". North Texas Tollway Authority (NTTA). Retrieved March 29, 2012.
- Staff. "Sam Rayburn Tollway/Central Expressway Interchange - Project Map (Original Version)". NTTA. Retrieved April 2, 2012.
- Staff. "Sam Rayburn Tollway/Central Expressway Interchange - Project Map (Updated Version)". NTTA. Retrieved March 29, 2012.
- Google Inc. Google Maps – Overview Map of Spur 399 (Map). Cartography by Google, Inc. http://maps.google.com/maps?f=d&source=s_d&saddr=Sam+Rayburn+Tollway&daddr=TX-399+Spur+E+to:TX-399+Spur+E+to:TX-399+Spur+E&hl=en&geocode=FWzg-QEdASM9-g%3BFdv1-QEdwFU9-g%3BFQMC-gEd2W49-g%3BFV4U-gEd9os9-g&abauth=c07687d4:ybnh0N3FxK7J2AULgU5oBM50IYU&vps=6&ei=mqBzT6alHIqMyAWXgfGbCQ&jsv=403d&sll=33.16202,-96.63806&sspn=0.005344,0.006899&vpsrc=6&mra=ls&num=10&mid=1332977878. Retrieved March 29, 2012.