Virginia Department of Transportation map shows boundaries of Route 7 widening project.

Crews are scheduled to shift the travel lanes on part of westbound Route 7 on Wednesday night as part of the project that will widen the heavily used commuter route in western Fairfax County.

The overall goal of the $37 million project is to widen Route 7 to three lanes in each direction between Rolling Holly Drive and Reston Avenue. The work is scheduled to be done by the end of 2015, the Virginia Department of Transportation says.

For the phase starting Wednesday night, workers will shift the westbound traffic slightly to the south. Residents and businesses along this stretch will use a temporary access road. There’s a new signal at Redberry Court providing access to both directions on Route 7, VDOT says.

In addition to widening the highway, the project will lengthen the turn lanes and improve the intersections at Georgetown Pike and Seneca Road. It also will create 10-foot wide paths in both directions.