SAN MATEO COUNTY, CALIFORNIA — A multi-vehicle crash on southbound U.S. Highway 101 near Millbrae created significant traffic congestion Friday, prompting a large emergency response and causing lengthy delays for motorists traveling through the San Francisco International Airport (SFO) corridor.
According to the California Highway Patrol (CHP), the collision occurred on southbound Highway 101 near the Millbrae Avenue off-ramp, one of the busiest commuter routes on the San Francisco Peninsula. Emergency dispatch logs indicate that multiple units were sent to the scene after reports of a traffic collision involving several vehicles.
Police officers, firefighters, and emergency medical personnel responded quickly to secure the crash site, assist those involved, and manage traffic as vehicles backed up for several miles approaching the area. Motorists traveling toward San Francisco International Airport and neighboring communities experienced slow-moving traffic while responders worked to clear damaged vehicles and investigate the incident.
Authorities have not yet confirmed the total number of vehicles involved or whether anyone sustained injuries. Officials also have not released information regarding the cause of the collision, and investigators continue to examine the circumstances that led to the crash.
As part of the investigation, officers are expected to document the scene, review available traffic camera footage, and speak with witnesses. Anyone who observed the collision or has relevant dashcam footage may be asked to assist investigators as they work to establish a complete timeline of events.
The crash temporarily affected one of the Bay Area’s busiest transportation corridors, with traffic delays extending through the Millbrae and SFO area during the emergency response. Drivers were urged to slow down when approaching emergency vehicles, follow traffic directions, and consider alternate routes until the affected lanes were reopened.
Traffic incidents along Highway 101 can have widespread impacts because the freeway serves thousands of commuters each day traveling between San Francisco, the Peninsula, and Silicon Valley. Even relatively minor collisions can quickly lead to extensive backups during peak travel periods.
Authorities continue to investigate the incident, and additional information regarding the number of vehicles involved, the extent of any injuries, and the factors contributing to the crash is expected to be released as the investigation progresses. Motorists are encouraged to monitor official traffic updates and exercise caution while traveling through the area until normal traffic conditions are fully restored.