SH 121 will be closed 10 p.m.-5 a.m. Nov. 17 through the morning of Nov. 22 at Custer Road in both Frisco and Plano.
According to the North Texas Tollway Authority, drivers traveling northbound on Custer Road will turn right on SH 121 and make a U-turn at Exchange Parkway. They can then drive west until they reach Custer Road, turning right to continue northbound.
Drivers traveling southbound on Custer Road will turn right on SH 121 and make a U-turn at Independence Parkway. They can then drive east until they reach Custer Road, turning right to continue southbound.
The lane closures are subject to weather conditions and could be postponed if necessary, according to the NTTA.
The widening project on the SRT includes adding a fourth lane to the entire stretch of the tool road between US 75 and Denton Tap Road. The project is scheduled to be complete by late 2021.