San Mateo Express Lanes Now Open! The new 22 miles of express lanes on U.S. 101 from the San Mateo County/Santa Clara County Line to I-380 in South San Francisco are fully operational as of March 3.

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San Mateo
101 Express Lanes

The San Mateo 101 Express Lanes Project is 22 miles of express lanes in both directions on U.S. 101 from the San Mateo County/Santa Clara County Line to I-380 in South San Francisco. The San Mateo 101 Express Lanes will seamlessly connect to the express lanes being constructed in Santa Clara County.

A goal of the express lanes is to enable travel speeds of 45 mph or greater, resulting in reduced and more reliable travel times.

Key Project Benefits:
* Reduce congestion in the corridor
* Increase person throughput (the number of people moved)
* Encourage carpooling and transit use
* Improve travel time and reliability for express lane users
* Use modern technology to manage traffic