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20th Street Slow Street

Project Introduction

The 20th Street Slow Street provides an east-west connection through the Mission neighborhood, connecting the Shotwell Slow Street and Potrero Avenue bike facilities. 20th Street was designated as a COVID-19 Response Slow Street in June 2020. 20th Street was not initially included in the permanent Slow Streets Program because of conflicts with commercial land uses and heavier vehicle traffic volumes west of Shotwell Street. After hearing from many community members and stakeholders who wanted to keep 20th as a Slow Street for its traffic calming, bikeway network, and community space benefits, shortened extents were proposed in order to eliminate the biggest conflicts with commercial land uses and heavier traffic volumes west of Shotwell, while maintaining the connection between the existing bikeways on Shotwell Street and Potrero Avenue. 20th Street was re-authorized as part of the permanent Slow Streets Program at the March 21, 2023 San Francisco Municipal Transportation Agency (SFMTA) Board meeting. 

    Learn more about the Slow Streets Program

    20th Slow Street Evaluation

    Following the SFMTA Board’s approval of 20th Street, the SFMTA Project team collected additional data analysis to assess how the street is performing against the Slow Streets Program targets:

    • Vehicle speeds at or below 15 mph
    • Vehicle volumes less than 1,000 per day

    The 20th Street Slow Street does not meet the Program speed or volume targets

    For additional information on how this street compares to others in the Slow Streets program, or for overall program findings, please see the 2023 Evaluation Report.

    Project Timeline 
    March 2023
    Project Approval
    Winter 2023
    Data Collection and Evaluation
    Summer 2023
    Design process
    Fall 2023

    20th Slow Street Design

    This design was approved by the SFMTA Board on March 21, 2023. The design for 20th Street approved by the SFMTA Board maintains the existing Slow Streets delineators at Harrison, Bryant and Hampshire Streets, and adds new continental crosswalks at Alabama, Florida, York, and Hampshire streets as well as Slow Streets pavement markings and wayfinding signs.

    View the design

    Next Steps

    Spring 2023: Implementation of the 20th Street Slow Street Design is in process. 

    Questions or feedback? Email and include "20th Street" in the subject line. To receive Project updates, please sign up via the link on the righthand side of this page.


    Contact Information