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County outlines Moss Beach SR‑1 safety plan, two build alternatives and environmental review timeline
Summary
San Mateo County planners presented two build alternatives for the Moss Beach State Route 1 congestion and safety project — roundabouts plus a signal, or three signals — and said a draft environmental document will be released for public review in late spring/early summer 2026 with an open‑house planned. The project team urged focused environmental comments during the 30‑day public review. (Chanda Singh, County of San Mateo)
County senior transportation planner Chanda Singh told the Midcoast Community Council that the Moss Beach State Route 1 Congestion and Safety Improvements Project aims "to improve traffic operations and increase, safety for all users, pedestrians, bicyclists, transit users, and drivers, and increase access to the resources on either side of the highway." She said the county and the San Mateo County Transportation Authority (SMCTA) are working with Caltrans to move the project through the Caltrans project development process.
Singh described two alternatives under study for Highway 1 between Marine Boulevard and 14th Street. Build Alternative 1 would add roundabouts at Cypress Avenue and California Avenue and install a traffic signal at 16th Street; Alternative 2 would rely on traffic signals at those three intersections and omit roundabouts. Singh said both concepts include substantial bicycle, pedestrian…
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