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San Mateo 101 Express Lanes Project is beginning soon!

Post Date:03/27/2019 1:57 PM

The San Mateo 101 Express Lanes Project is beginning soon! Caltrans is constructing express lanes on U.S. 101 from I-380 in San Bruno to the San Mateo County/Santa Clara County border. Construction activities will begin in Palo Alto and continue northward to South San Francisco. Construction is expected to occur between 2019 and 2022.

Construction is starting soon!

Project construction is starting the week of March 17, 2019. Closures of select lanes will occur nightly between 9 p.m. and 5 a.m. (excluding Friday and Saturday nights). No daytime lane closures are anticipated. Over the next three months, construction activities will take place in Palo Alto, East Palo Alto, Menlo Park, and Redwood City. During this time, construction activities will be limited to the shoulders and median of U.S. Highway 101.

Construction activities include placing temporary concrete barriers, demolishing portions of the existing median barrier, removing pavement, and installing temporary traffic monitoring equipment. Caltrans has constructed express lanes in other areas and found that noise associated with these activities was largely blocked by existing sound walls. Therefore, construction is expected to cause only minor noise increases. Nighttime lighting will also be used, but lights will be pointed toward the roadway to minimize impacts to nearby residents. Follow @CaltransD4 on Twitter and visit the project website for additional construction updates.

Project Overview

The San Mateo 101 Express Lanes Project is a multi-year, multi-agency project initiated to reduce traffic congestion and encourage carpooling and transit use on U.S. 101 in San Mateo County.

SM 101 Express Lane 

The project will create 22 miles of express lanes on U.S. 101 from I-380 in San Bruno to the San Mateo County/Santa Clara County border. The San Mateo 101 Express Lanes will then seamlessly connect to the express lanes being constructed in Santa Clara County. The figure below shows the express lanes. Project construction will begin in Palo Alto, just beyond the end of the express lanes, and continue northward.

Construction to convert the existing HOV lanes from the San Mateo County/Santa Clara County border to Whipple Avenue is beginning the week of March 17, 2019. Construction to add a lane from Whipple Avenue to I-380 will begin later in 2019. Construction is projected to end in 2022. During construction, every effort will be made to minimize impacts on existing traffic flow and neighboring communities.

The project will:

  • Encourage carpooling and transit use
  • Improve travel time and reliability for all express lane users
  • Increase the total number of people moved on the road
  • Use technology to manage traffic flows
  • Reduce congestion in the corridor
  • Upgrade pavement and lane re-striping

For more information on the project or to ask questions, please visit the project website


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