Motorists travelling across the Dumbarton Bridge in the San Francisco Bay Area are being advised to exercise caution following reports of a traffic collision on State Route 84. The incident has drawn attention to traffic conditions around Fremont and Menlo Park, where the bridge connects Alameda and San Mateo counties.

As of Wednesday, November 11, 2026, available traffic information indicates a collision on westbound Highway 84 near Fremont, alongside a separate fog advisory affecting both directions of the Dumbarton Bridge.

Collision Reported Near Fremont

A traffic incident was listed on westbound Highway 84, west of Interstate 880 in Fremont. The report indicated that the left lane was blocked, with motorists warned to expect delays.

The available information did not establish the number of vehicles involved, whether anyone was injured or what caused the collision. It was also unclear whether the crash occurred directly on the bridge or on the approaching section of the highway.

Fog Advisory Affects Dumbarton Bridge

In addition to the collision report, transportation information indicated dense fog along Highway 84 in both directions between the Dumbarton Bridge toll plaza in Fremont and University Avenue in Menlo Park.

Reduced visibility can make driving particularly challenging on the bridge and its approaches. Motorists are advised to reduce speed, maintain a safe following distance and use appropriate vehicle lighting.

Emergency Response and Traffic Conditions

The California Highway Patrol monitors collisions and traffic hazards along the highway, while Caltrans provides updates on road conditions and lane restrictions.

At the time of the available reports, specific details about emergency crews, injuries, vehicle damage or an investigation into the reported collision had not been confirmed.

Drivers should check current traffic information before travelling and follow instructions from responding officers.

Further Updates Awaited

The reported collision on westbound Highway 84 and the fog advisory are separate traffic concerns affecting the Dumbarton Bridge corridor on November 11.

Until additional details are released, the cause of the collision and whether anyone was injured remain unknown. Motorists are encouraged to remain alert and allow extra travel time when crossing between Fremont and Menlo Park.