Accident
High Severity
Resolved
CHP : Traffic Collision on US-101 Southbound north of Sister Cities Blvd (South San Francisco). Off Ramp affected. Expect delays.
A high-severity accident was reported on US-101 S near San Mateo on September 13, 2026 at 9:49 AM.
Last Updated
1 month, 2 weeks ago
Sep 13, 6:30 AM
Resolved
Sep 13, 12:30 PM
Coordinates
37.6696, -122.3931
Update History
3 observations
CHP : Traffic Collision on US-101 Southbound north of Sister Cities Blvd (South San Francisco). Off Ramp affected. Expect delays.
Sep 13, 3:00 AM
CHP : Traffic Collision on US-101 Southbound north of Sister Cities Blvd (South San Francisco). Lane affected. Expect delays.
Sep 13, 2:45 AM
CHP : Traffic Collision on US-101 Southbound north of Sister Cities Blvd (South San Francisco). Lane affected. Expect delays.
Sep 13, 2:30 AM
Source: 511_sfbay · ID 511.org/1548706
First seen Sep 13, 2026 2:30 AM