Traffic Alert for the week of October 19.

Commuters should be aware of the following lane closures and construction in both Sonoma and Marin counties.

In Sonoma Valley:

• On Highway 12 between Trinity Road and Arnold Drive, there will be one-way traffic control from 9 p.m. to 7 a.m., Monday night/Tuesday morning through Thursday night/Friday morning.

Throughout Sonoma County:

• Sonoma Mountain Road will be subject to traffic control for road work and brush cutting on from October 12 to 21. Expect delays, alternate routes are recommended.

• On Highway 101 from the Rohnert Park Expressway to Santa Rosa Avenue.

• On Monday night through Friday morning, the north and southbound either #1 or 2 lanes will be closed from 11 p.m. to 5 a.m.

• The northbound Rohnert Park Expressway will be closed from 10 p.m. to 7 a.m.

• The northbound offramp to Wilfred will be closed from 8 p.m. to 7 a.m.

• The northbound on ramp from Wilfred will be closed from 10 p.m. to 7 a.m.

• The northbound offramp to Santa Rosa Avenue will be closed from 8 p.m. to 8 a.m.

In Marin county:

• On northbound Highway 101 from the Marin county line to Santa Rosa, various lanes at various locations will be closed from 10 p.m. to 6 a.m.