More 20 MPH Streets Coming Soon Near You

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Wednesday, March 2, 2022

Last October when California Assembly Bill 43 (Friedman) was signed into law, we posted a blog about the new law about which gave cities new flexibility in setting speed limits—specifically reducing them. “Speed Management,” a reference that is still in development, focused on reducing speed limits in key business activity districts where at least 50% are dining or retail. Since the bill went into effect last month, we’ve already started lowering speed limits by 5 MPH (from 25 MPH to 20 MPH) in the first phase of approved corridors, four of which have been implemented: 

  • San Bruno Avenue, from Silver to Paul avenues (Completed January 2022) 

  • Polk Street, from Filbert to Sutter streets (Completed January 2022) 

  • Haight Street, from Stanyan Street to Central Avenue and from Webster to Steiner streets (Completed February 2022) 

  • 24th Street, from Diamond to Chattanooga streets and from Valencia Street to San Bruno Avenue (Completed February 2022) 

The remaining corridors of this phase scheduled to completed through April 2022 are scheduled as follows: 

  • Fillmore Street, from Chestnut to Union streets and from Jackson to McAllister streets (Scheduled March 2022) 

  • Valencia Street, from Cesar Chavez to Market streets (Scheduled March 2022) 

  • Ocean Avenue, from Geneva Avenue to Victoria Street and from Junipero Serra Boulevard to 19th Avenue (Scheduled April 2022) 

An articulated coach approaching a new 20 mph speed limit sign at the intersection of San Bruno and Wayland Ave.

Phase 2 proposes an additional 35 business activity districts and corridors and will go to the MTA Board for legislation this spring with a goal to begin installation in Summer 2022. Additional locations in Phase 3 will be proposed later this year. Check out the updated map below for more information. 

Map of proposed and potential business activity district streets. 20 MPH corridors identified as Batch One include stretches of Fillmore, Haight, 24th, Polk and Valencia streets, Sn Bruno Avenue, Ocean Avenue. 20 MPH corridors identified as "eligible for future consideration under AB43" include sections of inner and outer Clement, inner and outer Balboa, Chestnut, Union, Pacific, Columbus, Grant, Powell, Geary, O'Farrell, Divisadero, 9th Avenue, Upper Market, inner Mission, Irving, Noriega, Taraval, West Portal, outer Mission, Cortland, Geneva and Third Street. Neighborhoods marked on the map as "Area for Future Study" include Fisherman's Wharf/North Beach/Chinatown, Financial District, South of Market, Hayes Valley, and Mission Bay. Areas on the map marked as "Existing 20 MPH corridors" include Market Street, and all streets in the Tenderloin bounded west by Van Ness Avenue, north by Sutter Street, East by Mason, and south by Market Street.

Map of Business Activity District Streets showing existing 20 mph corridors including: Phase 1 (20 mph corridors), Phase 2 (proposed 20 mph corridors for legislation), Phase 3 (eligible 20 mph corridors for future consideration under AB 43).

Speeding Kills – Just 5 miles over the limit is twice as likely to kill. 

Because speeding is the leading cause of traffic deaths and severe injuries in San Francisco, slowing speeds is the single most effective tool for achieving Vision Zero, the citywide commitment to ending traffic deaths. This current speed reduction work builds off other SFMTA programs to create safer streets and encourage slower streets such as the first neighborhood-wide 20 MPH speed limit changes in the Tenderloin or reducing speeds on Market Street to 20 MPH. Through this collective speed management work, 75 miles of streets across the city will have 20 MPH speed limits. Over 50% of these streets are on the High Injury Network – the 13% of streets where more than 75% of severe and fatal crashes occur.   Find more information on the Speed Management project page.  


Vision Zero ( – Vision Zero is the City’s commitment to prioritizing street safety and ending traffic deaths. These deaths and injuries are unacceptable and preventable, and San Francisco is committed to stopping further loss of life. The full program is outlined in the Vision Zero SF Action Strategy