Big Rig Overturns, Triggers SigAlert on I-680

A big rig trailer overturned on northbound Interstate 680 near Andrade Road in Sunol on Wednesday afternoon, blocking two lanes and triggering a SigAlert. (patch.com) (msn.com) The California Highway Patrol reported the crash at 3:14 p.m. near Andrade Road, a stretch of I-680 that carries Tri-Valley traffic through Sunol. (msn.com) The overturned trailer also struck a Toyota RAV4 and forced it onto the freeway shoulder, according to the CHP account carried by Patch and MSN. (msn.com) (patch.com) CHP issued the SigAlert at 3:37 p.m. and warned drivers to expect extended delays while tow crews and road workers cleared the wreckage. (msn.com) The backup hit one of the Bay Area's regular choke points: the northbound I-680 Sunol Express Lanes run from Grimmer Boulevard in Fremont to Highway 84 in Sunol. (511.org) That corridor is a main route between Fremont, Pleasanton, Dublin and Contra Costa County, so a two-lane blockage near Sunol can quickly spill delays across the East Bay commute. (511.org) (patch.com) Patch reported the right lanes were blocked, while the CHP description carried by MSN said two lanes were closed as crews worked the scene. (patch.com) (msn.com) By late-day coverage, authorities had not posted an estimated reopening time, leaving commuters to detour or wait out the backup on I-680. (msn.com)