Moss Beach SR-1 Corridor Study

The County of San Mateo and the SMC Transportation Authority (TA), in cooperation with Caltrans, are initiating the Moss Beach SR-1 Congestion and Safety Improvements Project with the goal to improve traffic flow and safety in the project area. To stay aligned with the vision of Connect the Coastside, the project aims to meet the needs of drivers, cyclists, pedestrians, and transit riders, while preserving the character of the coastal community of Moss Beach.
Visit the County project webpage to learn more and to sign up for email updates.

Project Timeline

Project Initiation (completed Sept 2022 - Feb 2024) is the first formal project phase required by Caltrans to move forward with the Moss Beach Highway 1 recommendations identified in Connect the Coastside. During this phase, the project team will establish the purpose and need for the project, study challenges within the project area, identify possible solutions, and estimate the resources needed to complete improvements. Findings from the study are summarized in a Project Initiation Document (PID) and submitted to Caltrans for consideration.

Environmental Studies (2024 - 2026) involves preliminary design work and environmental studies to analyze the effect and impact of the project alternatives under state and federal laws CEQA and NEPA. The studies result in an Environmental Document (ED) which forms the basis for selecting the preferred alternative. The Draft ED is circulated for public comment, after which it is finalized and approved. Funding is with Measure W funds from SMC Transportation Authority.

Project documents (reverse chronological order):
2023 Oct 11: Phase 1 results presentation to MCC
2023 Aug 23: Phase 2 grant application MCC letter of support
2022 Nov 30: Phase 1 overview presentation to MCC
2021 Dec 2: TA approves grant application (table of projects)
2021 Nov 9: Board of Supervisors supports grant application (staff report, map)
2021 Sep 22: Phase 1 grant application presentation to MCC & MCC letter in support

See related: Roundabouts page

See also, archived page for SR-1 Congestion & Safety Improvement Project 2012-2019,
aka Midcoast Crossings, Raised Medians, & Turn Lanes, which was the first project planning effort to come out of the Hwy 1 Safety & Mobility Studies, but which did not result in any built projects.