Southbound Interstate 405 from Santa Monica to National boulevards in West Los Angeles will be fully closed the night of Tuesday, Dec. 17 from midnight to 5 a.m. Wednesday so lanes can be realigned to accommodate roadway widening and drainage work along the freeway’s median, officials said.

The work is part of the 405 Sepulveda Pass Improvements Project.

Lanes will begin to close at 10 p.m. Southbound Sunset on-ramp closes at 7 p.m. Southbound Wilshire on-ramps close at 10 p.m. Southbound Santa Monica on-ramp closes at 10 p.m.

Detour: From the southbound 405, exit at Santa Monica Boulevard, turn left to eastbound Santa Monica, turn right to southbound Sepulveda Boulevard, turn right to westbound National Boulevard, and turn left on to the southbound 405 on-ramp.

The freeway lanes could be closed Wednesday if the work is not completed on time.

The I-405 Sepulveda Pass Improvements Project will add a 10-mile carpool lane and improve supporting infrastructure such as ramps, bridges and sound walls on the San Diego Freeway; while widening lanes from Interstate 10 to U.S. Route 101.

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