Big Rig Overturns, SigAlert Blocks I-680
- A big rig overturned on northbound I-680 near Sunol, blocking lanes and prompting a SigAlert. - The right lanes of northbound I-680 were blocked for several hours, CHP said, causing major delays. - Commuters faced long backups during the evening commute as crews worked to clear the scene (patch.com).
A big rig overturned on northbound Interstate 680 near Andrade Road in Sunol on Wednesday afternoon, blocking two right lanes and snarling the East Bay commute. (msn.com) The California Highway Patrol reported the crash at about 3:14 p.m. on April 22, 2026, near the Mission Grade commercial vehicle enforcement off-ramp. CHP logs said the trailer rolled over and blocked lanes 3 and 4. (commutedash.com) The overturned trailer also struck a Toyota RAV4 and pushed it onto the right shoulder, according to CHP incident details. The agency issued a SigAlert at 3:37 p.m. and warned drivers there was no estimated time for reopening. (msn.com) A SigAlert is the traffic advisory California uses for major, unexpected lane closures that can disrupt a region for hours. In this case, the closure hit one of the main freeway links between the Tri-Valley, Fremont and Silicon Valley during the evening rush. (patch.com) Traffic backed up heavily between Sunol and Fremont as tow trucks and cleanup crews worked around the overturned trailer. CHP dispatch notes showed a heavy-duty tow request and lane blockages with the truck’s contents still in the slow lane. (msn.com) The crash landed on a stretch of I-680 that has seen repeated truck-related disruptions in the past year, including other Sunol-area overturns and debris spills. That corridor carries freight and commuter traffic through a narrow grade where even a two-lane blockage can ripple for miles. (nbcbayarea.com) By late afternoon, the main fact for drivers was simple: northbound 680 through Sunol was still jammed, and clearing the wreck was taking hours. (msn.com)
