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PRESS RELEASE and VIDEOS. From San Mateo County and Planning on February 4th, 2026.
Build Alternative #1: Roundabouts at Cypress and California and Signal at 16th Street
Build Alternative #2: No Roundabouts, Signals Only, No Medians
Both alternatives connect to Moss Beach’s Carlos Street with Montara’s 16th and 14th Streets.
Timeline:
2026: Public Outreach for Phase 2
2026-2029: Design and Right of Way
2030-2032: Construction (more funding needed)
The County is pleased to share that the Moss Beach State Route 1 Congestion and Safety Improvements Project continues to advance through the Caltrans Project Development Process. The Moss Beach Project will improve safety, access, and operations for all roadway users on Highway 1 from about 14th Street to Marine Boulevard.
The County, San Mateo County Transportation Authority, and Caltrans completed Phase 1 of the project in 2024. Since then, we have been working on Phase 2, which includes identifying environmental impacts of the project on topics like traffic safety and operations, animals and plants, noise, water and others, to comply with the California Environmental Quality Act and National Environmental Policy Act.
We have posted new videos to the webpage, including a quick overview of the project, features of the two Build Alternatives under study, and to explain what happens during the current environmental phase. Per Phase 1, Build Alternative 1 includes roundabouts at the intersection of Cypress Avenue and California Avenue and a traffic signal at 16th Street. Build Alternative 2 includes traffic signals at all three locations. Both alternatives include new pedestrian, bicycle and transit improvements.
Later this year, we’ll release the project’s draft environmental document and hold a public meeting. Thank you for staying engaged as the project progresses. We encourage you to share this message with other interested stakeholders and visit the webpage to learn more about the project, sign up for updates, and submit questions or comments.
This project is made possible by local transportation sales tax dollars provided by the San Mateo County Transportation Authority.
Please join our project mailing list to stay up to date.
Past Public Engagement
San Mateo County Bicycle and Pedestrian Advisory Committee, December 18, 2025
San Mateo County Transportation Authority Board of Directors, December 4, 2025
San Mateo County Transportation Authority Community Advisory Committee (CAC), December 2, 2025
C/CAG Bicycle and Pedestrian Advisory Committee, September 25, 2025
Midcoast Community Council, October 11, 2023
Presentation and Community Open House, September 19, 2023
Midcoast Community Council, November 30, 2022Please join our project mailing list below to stay up to date.
Build Alternative #1: Roundabouts at Cypress and California and Signal at 16th Street
Build Alternative #2: No Roundabouts. Signals at Cypress, California and 16th Street
Cypress Street Roundabout
California Street Roundabout
16th Street Light
16th Street Roundabout
Moss Beach SR 1 Congestion and Safety Improvements Project – Detailed Overview
Jan 29, 2026. This video provides information on where the Moss Beach Project is located, why it is needed, who is involved in moving it forward, what improvements are being considered, what happens during the project’s environmental phase as required by the California Environmental Quality Act and National Environmental Policy Act, and how to provide feedback. For more information, visit https://www.smcgov.org/planning/moss-…
Detailed Overview and Environmental Phase Background
Project Study Report-Project Development Support, February 28th, 2024
Moss Beach SR-1 Corridor Study History on Midcoast Community Council web site
More on the Moss Beach Hwy 1 Corridor Study on Coastside Buzz
SMCo and Caltrans Moss Beach Hwy 1 Corridor Congestion Project Environmental Studies and Project Approval Phase in 2025 ~ Roundabouts or Signalized Intersections?; December 24, 2024
San Mateo County Meets with Coastside Fire Protection District to Accommodate Fire Engines for the Two New Moss Beach Corridor Roundabouts; October 3, 2024
San Mateo County Applies for $4M for the Connect the Coastside’s Moss Beach SR-1 Congestion and Safety Improvements Project Environmental Documents; October 19, 2023
San Mateo County Transportation Authority’s Moss Beach State Route 1 Congestion & Safety Improvements Project Offers 3 Alternatives for Lights, Roundabouts and Medians; September 28, 2023
Midcoast Community Council (MCC) Summer 2022 Newsletter Summarizes ALL Midcoast Transportation Projects Including Project Timelines; August 11, 2022
CalTrans Presentation on Hwy 1 Multi-Asset Roadway Rehabilitation of Pavement, Guard Rails, Bus Stops, Drainage and Cameras; August 4, 2022
Midcoast Community Council and Connect the Coastside Transportation Study Session; August 6, 2020
Roundabouts? 16th, Cypress, California…..Moss Beach, Montara and HWY 92/35?; February 16, 2020
Crosswalk History in Moss Beach, Montara and Mirada; December 18, 2019
San Mateo County Board of Supervisors (BoS) Agendas
The Supervisors meet on the 2nd and 4th Tuesdays of the month at 9:00am, as a hybrid meeting.
Author: mdrag
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