ORINDA, Calif. (KRON) — A traffic collision on the westbound CA-24 at Wilder Road in Orinda has blocked the left lanes, according to the CHP, which has issued a severe traffic alert. Motorists are being advised to expect delays and use alternate routes. There is no estimated time to reopen the roadway.

A photo from near the scene shows traffic backed up heading toward the Caldecott Tunnel. Video from the scene shows first responder and tow vehicles appearing to clear vehicles that had been involved in the crash.

This is a developing story. Check back for updates.