SigAlert After Big Rig Overturns On I-680

A big rig’s trailer overturned on northbound Interstate 680 near Andrade Road in Sunol on Wednesday afternoon, prompting a SigAlert and blocking multiple lanes. (patch.com) The California Highway Patrol log cited by Patch says the crash was reported at 3:14 p.m. on April 22, 2026. The right two lanes were closed by 4:40 p.m. (patch.com) (msn.com) The overturned trailer struck a Toyota RAV4 and forced it onto the freeway shoulder, according to the same CHP incident details. Traffic backed up heavily between Sunol and Fremont. (msn.com) (patch.com) Sunol sits on one of the main links between southern Alameda County and the Interstate 580 and 680 split toward Pleasanton, Dublin and the wider East Bay. A lane-blocking crash there can quickly spill into the afternoon commute. (patch.com) (chp.ca.gov) The SigAlert signaled that the disruption was expected to be severe enough to affect traffic for an extended period, not just a brief slowdown. California Highway Patrol uses those alerts for major incidents that block lanes on heavily traveled roads. (chp.ca.gov) The crash followed another major truck overturn on the same Sunol stretch in April 2025, when a dump truck spilled dirt across both sides of Interstate 680 and caused major delays. That earlier wreck also drew a SigAlert. (patch.com) By late afternoon, the story for drivers was simple: northbound 680 through Sunol had turned into a choke point while crews worked to clear the trailer and reopen lanes. (patch.com)