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US 101/ SR 92 Interchange Short Term Area Improvements Project

Project Information

Project area map for the US 101/SR 92 Interchange Area Improvements Project in San Mateo County. Improvement 1: WB SR-92 to SB US-101 Ramp Modifications. Improvement 2: Modification of Lane Merge From US-101 Connector Ramps to EB SR-92. Improvement 3: SB US-101 Fashion Island Blvd Exit Ramp Modification. Improvement 4: NB US-101 At Hillsdale Blvd Exit Ramp And Intersection Modification And Widening.

Caltrans is partnering with the San Mateo County Transportation Authority and City/County Association of Governments of San Mateo County to implement improvements serving the U.S. 101 and State Route (SR) 92 interchange. The project is funded with approximately $50 million in local, state, regional, and federal funds.

Download the Project Flyer (PDF)
Hoja informativa (PDF)

Learn more about this project in San Mateo County Transit District's Wheel Talk podcast, where host Randol White and Caltrans public information officer Jeneane Crawford discuss the 101-92 Short-Term Improvements project as well as other transportation efforts connected to the interchange and surrounding communities.

Traffic Advisories

Project Purpose

The project will provide safety and operational improvements at four locations. These will improve traffic flow and safety, reduce hazardous movements, and improve local access to and from U.S. 101, resulting in operational improvements, enhancement to local access, and promotion of economic vitality. 

Nearby residents should expect overnight work, lane closures, on- and off-ramp closures, some noise and vibrations, and a temporary pedestrian detour at East Hillsdale Blvd. Caltrans will work to minimize traffic, noise, and other impacts to the surrounding communities where possible, such as conducting overnight work, using sound barriers, and implementing additional mitigation strategies.

The four improvements include:

  1. Westbound 92 to southbound U.S. 101: add more space to the loop connector to accommodate truck turns.
  2. Northbound and southbound U.S. 101 to eastbound 92: extend the outside lane to provide longer spacing for all five lanes to merge into three.
  3. Southbound U.S. 101 Fashion Island Blvd off-ramp: re-align the Fashion Island Blvd  off-ramp from the eastbound 92 connector ramp to the westbound 92 connector ramp to improve traffic flow.
  4. Northbound U.S. 101 Hillsdale Blvd off-ramp: add more space to the Hillsdale off-ramp for cars lining up to exit; upgrade the northbound on-ramp to meet current standards and add pedestrian crossing enhancements; and extend the third eastbound lane on the Hillsdale overcrossing.

Project Schedule

Construction work began in Spring of 2025 and is expected to be completed in the Summer of 2028.

Click here to view aerial drone footage showing initial phases of the work, shot in October 2025. The video features a bird’s eye view of construction at the U.S. 101/ SR-92 interchange.

Project Contact

Jeneane Crawford
Jeneane.Crawford@dot.ca.gov
(510) 390-3253

Updated October 2025