A wood-chipper trailer came loose from the truck towing it and hit another vehicle in the eastbound lanes of the Dumbarton Bridge about 6:30 this morning causing a considerable traffic jam, the California Highway Patrol reports.

There were injuries and the CHP issued a sig-alert for the eastbound Dumbarton.

An hour later the accident was in the clearing stages but there was a long backup and the CHP advised commuters to avoid the bridge for awhile, if possible.