Starting Sunday night, Caltrans crews plan nearly a week of nightly road closures while they pave and perform other maintenance along a section of Highway 37 between Sonoma County and Vallejo.
The first closure is scheduled to take place from 9 p.m. Sunday until 5 a.m. Monday.
The highway will be shut in both directions between Highway 29 in Vallejo and Highway 121 near Sonoma Raceway. The work crews will follow the same closure schedule each night until at least Friday.
Traffic in both directions will be detoured onto highways 29 and 121.
The 511.org website advised Highway 37 motorists to allow for extra travel time and to use caution along the detour routes.