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Somersville Road / Auto Center Drive

Highway Bridges over Somersville Road  -  Photo courtesy of Karl Nielsen
The Somersville Road/Auto Center Drive segment is the second construction segment along the corridor, between Loveridge Road and Contra Loma Boulevard/L Street. The project will expand the highway from four to eight lanes, including three mixed flow lanes and one High Occupancy Vehicle (HOV) lane, from just west of Somersville Road to just west of Contra Loma Boulevard/L Street. The project includes the reconstruction of the Somersville Road/Auto Center Dr. interchange, freeway auxiliary lanes, and a median wide enough to accommodate mass transit (BART).

Somersville Road Map


R&L Brosamer, Inc.


$43.2 million


Construction began in March 2011 and the segment opened two additional westbound lanes to traffic in December 2013.


Recently Completed Work:

  • On the morning of December 17, Caltrans and the Contra Costa Transportation Authority (CCTA) opened two additional westbound highway lanes from Contra Loma Boulevard/L Street in Antioch to Loveridge Road in Pittsburg.
  • Completed all work on the project.
New Westbound Lanes on Highway  -  Photo courtesy of Karl Nielsen