Bay/Porter to State Park Dr Aux Lanes, BOS & Mar Vista Overcrossing

Highway 1 Bay Ave/Porter St to State Park Dr Auxiliary Lanes/Bus-on-Shoulder, and Mar Vista Bicycle/Pedestrian Overcrossing

*Public comment period now open for the Draft Environmental Impact Report/Environmental Assessment for the proposed Highway 1 Auxiliary Lane Project from State Park to Bay/Porter. The 45-day public review and comment period is open through Jan. 11, 2021.

Written comments may be submitted by mail to Lara Bertaina, Department of Transportation, 50 Higuera St., San Luis Obispo, CA, or by email to All comments must be received by 5 p.m. on Jan. 11, 2021.

A virtual public meeting was held on Dec. 8, 2020 to provide the public with the opportunity to learn more about the project and submit comments before a final design is selected. View the meeting here:


Improvements Under Consideration

  • Northbound and southbound auxiliary lanes between Bay Avenue/Porter Street and Park Avenue interchanges and between Park Avenue and State Park Drive interchanges
  • Bus-on-Shoulder operations
  • Bicycle/pedestrian overcrossing at Mar Vista

  • Replace the existing Capitola Avenue bridge crossing Hwy 1 with a new bridge including improved sidewalks and bike lanes

Project Fact Sheet
Project Exhibit

Project Schedule

Schedule and cost for the project include environmental review, project design, right-of-way, and construction phases.

Phase Schedule
Environmental (PA/ED) Fiscal year 19/20 – 20/21
Final Design (PS&E) FY 20/21 – 21/22
Right-of-Way FY 21/22
Advertisement/Award* FY 22/23
Construction* FY 22/23 – 24/25

*Pending availability of funds for construction.

Project Purpose and Need

The purpose of the project is to:

  • Improve traffic and safety operations on Highway 1
  • Reduce cut-through traffic diverting to local streets and neighborhoods by
    adding auxiliary lanes between Bay Avenue/Porter Street and State Park Drive
  • Improve bicycle and pedestrian connectivity to regional destinations and
    transit by providing enhanced bicycle and pedestrian facilities for active
    transportation users at Capitola Avenue
  • Add infrastructure for buses to travel in the auxiliary lanes between
    interchanges and on the outside shoulder through interchanges
  • Improve bicycle and pedestrian connectivity to regional destinations and
    transit by providing a dedicated crossing for active transportation users at Mar Vista
  • Connect neighborhoods, schools, parks/beaches and commercial centers
  • Promote the use of alternative transportation modes to increase transportation system capacity and reliability
  • Widen the overcrossing at Capitola Avenue to current standards

This project is needed because:

  • Several bottlenecks along Hwy 1 in the southbound and northbound directions cause congestion during peak hours, significantly delaying drivers. As a result, “cut‐through” traffic—or traffic on local streets—is increasing because drivers are seeking to avoid congestion on the highway.
  • There are limited opportunities for pedestrians and bicyclists to safely navigate SR 1 in the project corridor, even though portions of the project area are designated as regional bicycle routes.
  • There are insufficient incentives to increase transit service in the Hwy 1 corridor because congestion threatens reliability and cost‐effective transit service delivery.
  • The existing length (i.e., span) of the Capitola Avenue overcrossing cannot accommodate a wider freeway. In addition, the existing overcrossing does not meet current standards for vertical clearance over the freeway, has substandard widths, and does not have bicycle lanes across the bridge. The bridge must be reconstructed to meet current standards.

Environmental Analysis

Caltrans plans to prepare a joint environmental document – an Environmental Impact Report/Environmental Assessment (known as an EIR/EA) – pursuant to the California Environmental Quality Act (CEQA) and the National Environmental Policy Act (NEPA). Caltrans is the lead agency under CEQA and is assuming responsibilities of lead agency for the Federal Highway Administration under NEPA assignment.

Caltrans distributed the Notice of Preparation to request comments from responsible and trustee agencies and interested members of the public regarding the significant environmental issues, reasonable project alternatives, and reasonable mitigation measures to be discussed in the draft EIR/EA.


Sarah Christensen, RTC Project Manager
(831) 460-3200