The I-405 Sepulveda Pass Widening Project will add a 10-mile carpool lane and improve supporting infrastructure such as ramps, bridges and sound walls on the San Diego Freeway (I-405); while widening lanes from the Santa Monica Freeway (I-10) to Ventura Freeway (US-101). This project will reduce existing and forecasted traffic congestion on the I-405 and enhance traffic operations by adding freeway capacity in an area that experiences heavy congestion.

In addition to these modifications, the project aims to improve both existing and future mobility and enhance safety throughout the corridor. Metro says project benefits will include a decrease in commuter time, reduced air pollution and more people ridesharing.

The I-405 Sepulveda Pass Widening Project features include: 

  • Add a 10-mile HOV lane on the northbound I-405 between the I-10 and US-101 freeways
  • Remove and replace the Skirball Center, Sunset Blvd. and Mulholland Dr. Bridges
  • Realign 20 on- and off-ramps
  • Widen 20 existing overpasses and structures
  • Construct approximately 18 miles of retaining wall and sound wall