Date: May 26, 2026

District: District 4 

Contact: Jeneane Crawford

Phone: 510-390-3253

SAN MATEO COUNTY ― Caltrans has scheduled intermittent ramp and lane closures of U.S. 101 in San Mateo County so that crews can repair drainage systems, upgrade curb ramps to Americans with Disabilities Act standards, repair guardrails, and perform paving operations.

Daytime Ramp Closures

Partial ramp closures during the day are scheduled between Embarcadero Rd. in East Palo Alto and South Airport Blvd. in South San Francisco from 7 a.m. - 5 p.m. Drivers should expect minor delays. There are temporary pedestrian detours and flaggers at the curb ramp locations for enhanced safety and access. Work will be carried out from:

• Tuesday, May 26 to Friday, June 26, 7 a.m. - 5 p.m.

Nighttime Lane Closures

Paving operations are underway on U.S. 101 between Whipple Ave. in Redwood City and Broadway Ave. in Burlingame, necessitating intermittent lane and ramp closures between 9 p.m. and 5 a.m.

The northbound right lanes (sometimes called "slow lanes") will be closed from:

• Tuesday, May 26 to Friday, May 29, 9 p.m. - 5 a.m.

The southbound left lanes (sometimes called "fast" lanes) will be closed from:

• Monday, June 1 - Friday, June 12, 9 p.m. - 5 a.m.

Drivers should follow posted detour signs when ramps are closed.

Please note that Caltrans will suspend nightwork between June 13 and July 2 to accommodate anticipated World Cup traffic.

This work is part of the $177M U.S. 101 (San Mateo County) Multi-Asset Rehabilitation & Roadside Safety Project. The project scope includes paving, guardrail improvements, transportation management system enhancements, drainage upgrades, and Americans with Disabilities Act-compliant curb ramps. The project will bring operational improvements and promote economic vitality in the region. The project is funded by the State’s Highway Operation and Protection Plan (SHOPP), a “fix-it-first” program that funds California highway repair and preservation.


All work is weather dependent. Please drive with caution. Thank you for your patience as we work to maintain our state’s highways, bridges, and tunnels.

For real-time traffic, click on Caltrans QuickMap: http://quickmap.dot.ca.gov/