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San Francisco

Slow Streets

Crash Data Analysis
By Stephen Braitsch & Beaudry Kock • Published on 12/8/2022
By Stephen Braitsch & Beaudry Kock
Published on 12/8/2022

On December 6th, 2022, the SFMTA Board of Directors, after a marathon 8 hour public comment session, unanimously approved 16 streets to become the foundation of a citywide Slow Streets network, including highly controversial Lake Street in the Richmond District. To prepare for this hearing, we analyzed crash data from the Department of Public Health to understand the impact these Slow Streets have had on public safety throughout a 2 year pilot program.

The 14 streets that participated in the pilot program collectively reduced vehicle crashes on them by 61% compared to just a 20% drop in crashes citywide. We compared an equal amount of time before and after each street became “slow” as you can see in the charts below. We used May 1st 2020 as the before and after boundary for citywide crashes as that was when the Slow Streets program roughly began. In the 26 months from March 1st, 2018 to May 1st 2020, San Francisco experienced 7,081 vehicle crashes on its streets. In the 26 months from May 1st 2020 to June 30th 2022, the city saw 5,634 vehicle crashes, a citywide decrease of 20.4%.

While San Francisco’s stay at home order during the pandemic clearly contributed to the decrease in driving and by extension crashes, to see that these 14 slow streets reduced crashes by 3x the citywide average is a testament to the success of the program. We thank the many advocates and organizers who helped us analyze and contextualize this data and bring to fruition this historic moment.

12th Avenue
Lawton St to Lincoln Way

12th Avenue became a Slow Street in April 2021 and has not seen a crash since signs discouraging through-traffic were installed. 12th Avenue typically experiences 1 to 2 crashes a year and has had 23 vehicle crashes since 2005. 12th Avenue is the only remaining Slow Street in the Sunset District after four other Slow Streets were removed due to complaints from impatient motorists who didn't like driving slowly on them on the way to dropping their kids off at school.

0
crashes Before
Becoming A Slow Street
0
crashes Since
Becoming A Slow Street
Crashes Resulting In Injury
There were no crashes
during this time period
23rd Avenue
Lake St to Cabrillo St

23rd Avenue became a Slow Street in June 2020 and like nearby Cabrillo Street, enjoys broad community support throughout the Richmond District due the organizing efforts of Richmond Family SF and a militia of neighbors who install and maintain art works and planters that discourage through-traffic along the corridor. 23rd Avenue is an important north / south connector to Slow Lake and Slow Cabrillo Streets and provides safe access to Alamo Elementary, St. Monica School and the Clement Street Corridor.

0
crashes Before
Becoming A Slow Street
0
crashes Since
Becoming A Slow Street
Crashes Resulting In Injury
There were no crashes
during this time period
Arlington Street
Roanoke St to Randall St

Arlington Street is the second safest Slow Street (after Hearst Avenue) and has not experienced a vehicle crash since 2016. Arlington Street officially became a Slow Street in August 2020.

0
crashes Before
Becoming A Slow Street
0
crashes Since
Becoming A Slow Street
Crashes Resulting In Injury
There were no crashes
during this time period
Cabrillo Street
23rd Ave to 46th Ave

Cabrillo Street has seen a dramatic 85% reduction in vehicle crashes since it became a Slow Street in August 2020. This is largely due to residents along the corridor installing and maintaining planters and art works at intersections that force drivers to slow down. The SFMTA has also been particularly diligent at maintaining official signage along Cabrillo Street that discourages cut-through traffic. Cabrillo Street provides a safe path of travel to nearby schools on Anza St. and Balboa St. as well as Fulton and Cabrillo Playgrounds and is the only Slow Street with a view of the Pacific Ocean.

0
crashes Before
Becoming A Slow Street
0
crashes Since
Becoming A Slow Street
Crashes Resulting In Injury
There were no crashes
during this time period
Clay Street
Arguello Blvd to Steiner St

Clay Street became a Slow Street in August 2020. Unlike nearly all other Slow Streets, Clay unfortunately has not seen a decrease in motor vehicle crashes in the 22 months since signs discouraging through traffic were installed. This is likely due to the lack of community organizing around Slow Clay Street and construction that has plagued the corridor over the past two years. Despite the relatively high frequency of vehicle crashes on Clay, it remains an important east / west corridor for active transportation on the north side of the city due to very little elevation change over its 2 miles. Of the six crashes that occurred on Clay since it was a designated a Slow Street, 1/2 of them were at major intersections, 2 were at Divisadero Street and 1 was at Presidio Avenue.

0
crashes Before
Becoming A Slow Street
0
crashes Since
Becoming A Slow Street
Crashes Resulting In Injury
There were no crashes
during this time period
Golden Gate Avenue
Masonic Ave to Broderick St

Golden Gate Avenue became a Slow Street in June 2020 and hasn't seen a vehicle crash between Masonic Ave and Broderick St since November 2019. The proposed 7 block extension to Parker Avenue however has experienced 4 crashes in the past 4 years and should immediately become part of the Golden Gate Avenue Slow Street. In July 2020, neighbors began installing planters and other furnishings, including a table and chairs, at intersections to help calm the corridor and created a very robust and “official looking” intersection barrier that has significantly reduced east bound vehicle traffic at Masonic Ave. Organizers for Slow Golden Gate Avenue also convinced the SFMTA to increase the number of flexposts from 3 to 4 to cover the width of the street and discourage cut-through traffic. Golden Gate Avenue provides safe access to San Francisco Day School and should be expanded east to Gough Street to include Gateway Middle School, the Buchanan Street Mall and Margaret Hayward Playground and west to Parker Ave to include the University of San Francisco.

0
crashes Before
Becoming A Slow Street
0
crashes Since
Becoming A Slow Street
Crashes Resulting In Injury
There were no crashes
during this time period
Hearst Avenue
Ridgewood Ave to Baden st

Hearst Avenue is the safest Slow Street in San Francisco as it has not experienced a vehicle crash since 2014. It officially became a Slow Street in April 2021 with the first traffic diverters installed in July. Hearst Avenue is a quiet residential street with many young families and two schools and is a critical link in San Francisco's bicycle network. Residents on Hearst have organized several events over the past 18 months which have helped galvanize community support for reducing vehicle traffic along the corridor. Google Maps has also been instrumental in reducing cut-through traffic on Hearst by redirecting vehicles to adjacent streets. Learn more about the community led efforts to make Hearst Avenue safer, healthier and more enjoyable for everyone. Learn more about the community led efforts to make Hearst Avenue safer, healthier and more enjoyable for everyone.

0
crashes Before
Becoming A Slow Street
0
crashes Since
Becoming A Slow Street
Crashes Resulting In Injury
There were no crashes
during this time period
Lake Street
Arguello Blvd to 25th Ave

Lake Street was designated a Slow Street by the SFMTA in April 2020. In the 26 months since signs were first installed discouraging through traffic, Lake saw a 50% drop in motor vehicle crashes compared to the 26 months prior. Lake is a particularly controversial Slow Street as it's a beautiful street that motorists love to drive on with little to no regard for the safety of the children who live on Lake and the thousands of pedestrians & cyclists who use Lake as an important east / west corridor. Learn more about the community led efforts to make Lake Street safer, healthier and more enjoyable for everyone. Learn more about the community led efforts to make Lake Street safer, healthier and more enjoyable for everyone.

0
crashes Before
Becoming A Slow Street
0
crashes Since
Becoming A Slow Street
Crashes Resulting In Injury
There were no crashes
during this time period
Lyon Street
Turk St to Haight St

Lyon Street is a relatively new Slow Street that was approved by the SFMTA in April of 2021. Despite Lyon being without official traffic diverters for 80% of the past year due to heavy construction, the corridor has not seen a crash resulting in injury since November 2020. This is largely due to an organized coalition of neighbors installing make-shift signs out of concrete buckets alongside an understanding throughout the neighborhood that Lyon should only be driven on when absolutely necessary. Slow Lyon enjoys widespread community support and has hosted several block parties over the past 18 months which would not have been possible if weren't a designated Slow Street.

0
crashes Before
Becoming A Slow Street
0
crashes Since
Becoming A Slow Street
Crashes Resulting In Injury
There were no crashes
during this time period
Minnesota Street
Mariposa St to 22nd St

MinneSLOWta, as the local community fondly calls it, became a Slow Street in August 2020. MinneSLOWta enjoys broad community support and is endorsed by all of the nearby neighborhood associations including Dogpatch, Potrero Boosters, South Beach, Rincon Hill and Mission Bay. Key to MinneSLOWta’s success in reducing cut-through traffic and vehicle crashes has been community installed planters, benches, and other bespoke furnishings at intersections that force motorists to slow down including a mid block planter at the top of a blind rise in the road between 20th and 22nd streets where crashes had frequently occurred. MinneSLOWta has a very strong community of volunteers organizing to improve the safety and livability of Minnesota Street and surrounding neighborhood. Learn more about their work and how you can get involved. Learn more about the community led efforts to make Minnesota Street safer, healthier and more enjoyable for everyone.

0
crashes Before
Becoming A Slow Street
0
crashes Since
Becoming A Slow Street
Crashes Resulting In Injury
There were no crashes
during this time period
Noe Street
Duboce St to Market St

Noe Street became a Slow Street in August 2020 and has only experienced 1 vehicle crash since June 2019. “Slowy Noe” enjoys broad community support anchored by the Duboce Triangle Neighborhood Association (DTNA) who have been organizing to calm streets throughout the neighborhood via their Slow Triangle initiative which was inspired by the Slow Streets program. DTNA organizers say that not only has the Slow Streets program significantly reduced through-traffic on Noe Street, it has really helped bring neighbors together to collaborate on improving the safety and livability of the neighborhood. DTNA has successfully reduced 14th Street to one lane of traffic in each direction and is working to improve pedestrian visibility at Steiner St. and Duboce Ave. and expand the commercial zone at Market and Noe streets to include better signage, tree plantings, green spaces and bulbouts. Slowy Noe is supported by the Castro Merchants Association and has received community development funding from WAMO, Cruise and the SFCTA. Learn more about the volunteers working to improve the safety and livability of Duboce Triangle and how you can get involved.

0
crashes Before
Becoming A Slow Street
0
crashes Since
Becoming A Slow Street
Crashes Resulting In Injury
There were no crashes
during this time period
Page Street
Stanyan St to Market St

Page Street is one of the most popular Slow Streets in San Francisco, enjoying broad support well beyond Haight Ashbury and District 5. It is a major east / west corridor for people cycling & scooting across the city and is wildly popular in large part due to an incredible community of volunteers who have installed & maintained signs and traffic calming measures while organizing numerous events over the past two years. In response to Page Slow Street's popularity, the SFMTA recently installed barriers at Stanyan and Masonic that discourage east bound vehicle traffic. These have significantly helped calm Page Street on those two blocks and the community is working to have similar treatments installed at Divisadero Street. While crashes are down on Page Street since traffic calming measures were first installed, there is still much more work to do to secure the corridor as the community gathering space and safe passageway it yearns to be. Learn more about the community led efforts to make Page Street safer, healthier and more enjoyable for everyone. Learn more about the community led efforts to make Page Street safer, healthier and more enjoyable for everyone.

0
crashes Before
Becoming A Slow Street
0
crashes Since
Becoming A Slow Street
Crashes Resulting In Injury
There were no crashes
during this time period
Sanchez Street
23rd St to 30th St

Sanchez Street became a Slow Street in June 2020 and has since enjoyed broad community support across Noe Valley in large part due to a team of dedicated volunteers who have organized block parties and community art installations that encourage people to pause and rethink how the street is used. Read this fantastic op-ed by one of the organizers of Slow Sanchez and learn more about the community led efforts to make Sanchez Street safer, healthier and more enjoyable for everyone. Learn more about the community led efforts to make Sanchez Street safer, healthier and more enjoyable for everyone.

0
crashes Before
Becoming A Slow Street
0
crashes Since
Becoming A Slow Street
Crashes Resulting In Injury
There were no crashes
during this time period
Shotwell Street
Cesar Chavez St to 14th St

Shotwell Street became a Slow Street in June 2020 and has seen an astonishing 89% drop in crashes since signs discouraging through-traffic were first installed. We attribute this to a combination of Google Maps redirecting through-traffic away from Shotwell and recognizing the turn restrictions at 16th, 20th and 25th streets in addition to community led efforts to pedestrianize the street via popup events along the corridor. Slow Shotwell Street is bookended by 14th Street and Precita Avenue, both of which are one-way streets that would benefit from the addition of contraflow bike lanes which would encourage more people using healthy modes of transportation to utilize Shotwell.

0
crashes Before
Becoming A Slow Street
0
crashes Since
Becoming A Slow Street
Crashes Resulting In Injury
There were no crashes
during this time period
Somerset Street
Silver Ave to Karen Ct

Somerset Street became a Slow Street in June 2020 and, alongside Clay Street, is the only other street that has seen an increase in vehicle crashes over the past two years. Slow Somerset Street provides access to multiple day care facilities, parks, schools and churches within just six blocks. Organizers for Slow Somerset say the neighborhood struggles with reckless driving, sideshows and large delivery vehicles and have been trying to get stop signs installed throughout the neighborhood for years. Somerset’s most recent crash at Silliman St. was around the corner from the popular Palega Recreation Center where organizers are also trying to get the city to install traffic calming measures including a lighted crosswalk at Holyoke and Felton streets.

0
crashes Before
Becoming A Slow Street
0
crashes Since
Becoming A Slow Street
Crashes Resulting In Injury
There were no crashes
during this time period
Acknowledgements

Thank you to the following safe street advocates & community organizers for their help analyzing and contextualizing the data: Alec Hawley, Andrew Casteel, Dave Alexander, Donovan Lacy, Emily Huston, Frank Tizedes, Jess Jenkins, John Elliot, Joseph Tartakovsky, Laura Skelton, Molly Hayden, Peter Belden, Parker Day, Robin Kutner, Sara Barz, Scott Feeney, Tiffany Delloue, Tim Hickey and Trish Gump.

About the data

The crash data used in this analysis is sourced from the San Francisco Department of Public Health who update it quarterly. The most recent data available is through June 2022. The raw data used in this analysis can be viewed here.

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