Caltrans will shut down up to four lanes of Interstate 405 in each direction through the Sepulveda Pass every night from Monday, Sept. 21, through Friday, Sept. 25, squeezing a freeway that Bel Air and Beverly Hills commuters rely on to reach the San Fernando Valley.

The overnight closures run from 9 p.m. to 6 a.m. nightly, according to Brentwood News LA. Crews will place K-rail barriers and pave asphalt as part of Caltrans' $143.7 million I-405 Pavement Rehabilitation Project.

Here is what drivers should expect each night:

Northbound I-405: Up to four lanes closed between Wilshire Boulevard and Skirball Center Drive/Mulholland Drive. The Getty Center Drive on- and off-ramp to northbound I-405 will also close.

Southbound I-405: Up to four lanes closed between U.S. 101 and Skirball Center Drive/Mulholland Drive. The Sepulveda Boulevard and Ventura Boulevard on- and off-ramps to southbound I-405 will close as well.

Freeway connectors: Both the northbound and southbound U.S. 101 connectors to southbound I-405 will shut down.

The speed limit through the Sepulveda Pass construction zone has been temporarily reduced to 55 mph. According to the Caltrans project page, that reduced limit and uneven pavement conditions are expected to remain through winter 2026 into early spring 2027.

The larger project spans 10.2 miles between Van Nuys and Westwood and will restore nearly 92 lane miles of pavement. A joint venture between CA Rasmussen, Inc. and FBD Vanguard Construction, Inc. is doing the work. Construction began in summer 2025, and Caltrans projects completion by winter 2027.

Caltrans has urged drivers throughout the project to use public transit or plan alternate routes. In July, during a separate 55-hour weekend closure on the same stretch, the agency advised commuters to use public transit or map out alternate routes.

Residents and businesses near the construction zone should expect noise, vibrations and dust during overnight hours. Schedules are subject to change based on weather and operational conditions. Drivers can find real-time traffic updates at Caltrans QuickMap and sign up for weekly project email alerts through the Caltrans project page.