Big Rig Overturns, I-680 SigAlert Issued

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) The California Highway Patrol log said the trailer overturned at 3:14 p.m. on April 22, 2026. CHP issued the SigAlert at 3:37 p.m. (patch.com) CHP said the overturned trailer then struck a Toyota RAV4 and pushed it onto the right shoulder. The truck remained across two right lanes until a tow truck could reach the scene. (patch.com) By 4:40 p.m., the two right lanes of northbound I-680 were still closed. CHP Dublin warned drivers to expect delays for the afternoon commute and said the estimated reopening time was unknown. (patch.com) 511.org still showed the SigAlert in effect at 4:39 p.m. Patch reported heavy traffic on northbound I-680 between Sunol and Fremont as the backup grew. (511.org) (patch.com) The closure hit one of the East Bay’s main commuter corridors linking southern Alameda County with Fremont, Pleasanton, and the wider I-680 route. A two-lane blockage there can quickly snarl late-afternoon traffic. (511.org) (patch.com) As of the latest public updates in the reports reviewed, authorities had not posted an injury summary or a firm clearance time. The immediate focus was towing the trailer and reopening the blocked lanes. (patch.com)