One lane of Interstate 81 South in Montgomery County will be closed starting at 11 p.m. Friday night.

The lane closure will be between mile markers 120 and 125 from 11 p.m. Friday night until 7 a.m. Saturday morning. The closure is needed while Virginia Department of Transportation crews continue work on a truck climbing lane project.

Also, a lane closure is scheduled from 9 p.m. Monday to 6 a.m. Tuesday morning.

Work on the truck climbing lane project is expected to be finished in November.