Local authorities in San Mateo County have urged the public to avoid Highway 1 just south of Pacifica. An active investigation and heavy police presence have led to travel disruptions, with officials focusing on the area between the Tom Lantos Tunnels and Gray.
Heavy police presence on Highway 1 south of Pacifica

Key Takeaways:
- The San Mateo County Sheriff’s Office is conducting an active investigation on Highway 1.
- Authorities announced the advisory around 9:50 a.m. on Wednesday.
- A large law enforcement presence is reported south of Pacifica, between the Tom Lantos Tunnels and Gray.
- Residents and commuters are advised to avoid this stretch of Highway 1.
- Published details come from Kron4 on 2025-09-25 at 16:58:53.
Context of the Investigation
The San Mateo County Sheriff’s Office announced at 9:50 a.m. on Wednesday that Highway 1 just south of Pacifica is now under scrutiny due to an active investigation. Highway 1 is a vital route along the coast of the Bay Area, often used by both local residents and visitors.
Location and Public Advisory
Law enforcement officials have concentrated in the stretch of Highway 1 lying between the Tom Lantos Tunnels and Gray. In an effort to ensure public safety and streamline investigative operations, the Sheriff’s Office is recommending that drivers, pedestrians, and residents avoid this zone until further notice.
Extent of Law Enforcement Presence
A large presence of officers has gathered in the designated area. This heavy deployment indicates the significance of the ongoing situation. Traffic along the affected stretch may be delayed or diverted, although the exact nature of the investigation remains undisclosed to the public.
Official Information Source
Kron4 reported the advisory and published the story on September 25, 2025, at 16:58:53. The Sheriff’s Office remains the primary authority on any updates, and the public is encouraged to follow official channels for further developments regarding this incident.