The westbound Ventura (101) Freeway will be closed at the western end of the San Fernando Valley Sunday night by Caltrans for road work, the agency announced Sunday.
The four-lane westbound freeway will be shut down from Parkway Calabasas west to Las Virgenes Road from midnight Sunday to 5 a.m. Monday.
Traffic will be detoured on the two-lane frontage road, known as Calabasas Road, and then will cross to the northern side of the freeway via Mureau Road.
Those roads have one westbound lane, and traffic can be expected to back up.
Better detours from L.A. to Ventura County include Pacific Coast Highway through Malibu, or state routes 118 and 23 through Simi Valley and Moorpark.
Caltrans announced the closure today on Twitter. Eastbound traffic will not be restricted.