UPDATE: IB & OB 54 Felton has resumed regular route. Non-Muni collision @ Avalon/Moscow cleared. https://t.co/zcblClkY3t (More: 5 in last 48 hours)

California Street Safety Project

Project Timeline 
Summer to Fall 2019
Preliminary Engineering
Summer to Fall 2019
Fall 2019
End of 2019
Quick-Build Construction
Summer 2020
Road Diet Implementation
Project Status

Per the City and County of San Francisco's Public Health Order, essential infrastructure projects, including the California Street Safety Project, continue. The SFMTA continues to monitor projects as the situation develops.

The California Street Safety Project will improve safety for those traveling on the corridor by reconfiguring the roadway from four lanes to three, upgrading crosswalks, daylighting and other safety improvements. California Street is part of the city’s Vision Zero High-Injury Network that consists of the 13 percent of all San Francisco streets that account for 75 percent of severe and fatal collision.


On California Street from Arguello Boulevard to Park Presidio Boulevard, a roadway reconfiguration from four lanes to three will be implemented to improve safety for all road users. On this stretch of the corridor, there have been 57 injury collisions in the past five years, including 4 pedestrian-involved collisions. This segment of California Street also has a high rate of Muni-involved collisions, with 35 transit collisions in five years. At 8 to 9 feet wide, the travel lanes are not wide enough in this area for Muni vehicles, which are 10.5 feet wide. As a result, Muni vehicles must straddle multiple lanes, leading to sideswipe collisions. In addition, having multiple lanes in each direction can encourage higher traffic speeds and can make crossing the street more challenging for pedestrians. It is currently anticipated that these improvements will be constructed in spring 2020.

What is a road diet?

A road diet is a traffic safety measure that is widely used in San Francisco and across the country. Similar road diets that convert four lane street to a three lane street with a center turn lane have shown an 19-47% reduction in collisions, according to the Federal Highway Administration. A local example of an effective road diet on 25th Avenue in the Richmond reduced collisions by about 20%, while a road diet on Fulton Street between Central and Stanyan reduced collisions by 43%. 

^Example of existing conditions and roadway reconfiguration on 25th Avenue. 

In tandem with this effort, on California Street from Arguello Boulevard to 18th Avenue, improvements will be installed, which will include daylighting, high-visibility crosswalks and pavement marking to improve safety for people of all ages on a street with historically high rates of injury-related collisions. This project is part of the Vision Zero Quick-Build Program. As part of our commitment to the program, these improvements will be installed by the end of 2019.

Proposed improvements include:

  • Daylighting - adding red painted curbs at intersection approaches to improve visibility for all road users
  • Reconfiguring the roadway from four lanes to three to include one lane in each direction, with a flexible center turn lane
  • Continental Crosswalks
  • Advanced Limit Lines
  • Signs
  • Signal timing adjustments to increase walking time for pedestrians

Evaluation and Timeline

All Quick-build projects are built with elements that can be removed or adjusted if needed. 

The SFMTA will be evaluating the impacts of the project over a 24-month period, to include metrics such as:

  • collisions,
  • travel time for Muni and private cars,
  • vehicle speeds,
  • yielding behavior of drivers to pedestrians,
  • and traffic volumes.

After evaluating the impacts of the project, SFMTA will review whether any adjustments are needed to ensure the project meets its safety goals.

Have more questions?

Check our Frequently Asked Questions for more information about the project. 

San Francisco County Transportation Authority logo
Vision Zero SF logo
Contact Information
Erin McMillan, Public Information Officer