According to the California Highway Patrol, the pileup was reported around 1:52 a.m., January 18, on northbound Highway 101 just south of the Peninsula Avenue off-ramp.

San Mateo, CA – Major injuries were reported in a multi-vehicle collision that happened early Sunday morning in San Mateo.
According to the California Highway Patrol, the pileup was reported around 1:52 a.m., January 18, on northbound Highway 101 just south of the Peninsula Avenue off-ramp.
Four vehicles, including a blue Toyota, a gray Kia SUV, and a black Honda pickup truck, were involved in the collision.
Firefighters and paramedics responded to the scene and helped at least one person who suffered major injuries. The victim was transported to San Francisco General Hospital for treatment.
Multiple traffic lanes were closed following the crash. All lanes were reopened around 3:06 a.m.
CHP officers are investigating the collision.
In the 2023 California Office of Traffic Safety (OTS) crash rankings for San Mateo, California, the city recorded 292 victims killed or injured in reported traffic collisions, placing it 41st out of 62 similarly sized California cities, indicating a mid-range level of serious crashes compared with peers. Alcohol-involved collisions accounted for 30 victims (46/62), while motorcycle-related incidents involved 17 victims (23/62), and bicyclists accounted for 20 victims (31/62). Crashes involving pedestrians were notably high relative to other cities, with 44 pedestrian victims ranking 8th out of 62, including 8 older adults (65+) also at 8/62 in that age group. Speed-related collisions numbered 39 (47/62), and hit-and-run collisions were 28 (29/62), showing ongoing safety concerns in those categories. San Mateo also reported 234 DUI arrests for 2023, ranking 50th/62 among its peers.
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