Here’s the press release from Metro:

The I-405 Sepulveda Pass Improvements Project contractor is planning to close the northbound I-405 between the I-10 and Santa Monica Boulevard in West Los Angeles the night of Wednesday, April 23 from midnight to 5 a.m. Thursday, April 24.  The closure will facilitate installation of mainline traffic loops.

Ramps will be closed as early as 7 p.m., and lanes will begin to close at 10 p.m. 

Ramp Closures:

Eastbound and westbound I-10 connectors to northbound I-405

Northbound I-405 on-ramp from Olympic Boulevard/Pico Boulevard (on Cotner Avenue)

Detour:

From westbound I-10: exit Bundy North, turn right to northbound Bundy Drive, turn right on eastbound Santa Monica Boulevard, and turn left to enter the northbound I-405 at the Santa Monica Boulevard on-ramp.

From eastbound I-10: exit at Overland Avenue off-ramp, turn right to northbound Overland, turn left to westbound Pico Boulevard, turn right to northbound Sepulveda Boulevard, turn left to westbound Santa Monica Boulevard, and turn right to enter the northbound I-405 at the Santa Monica Boulevard on-ramp. 

What to expect:

• Work is dependent on favorable weather conditions.
• Emergency access will be maintained at all times.

For a listing of daily closures and latest updates visit our website at www.metro.net/405 or follow us on twitter: www.twitter.com/I_405 and Facebook atwww.facebook.com/405project.