Our mission is to provide you with data and resources that help you have informed, constructive conversations with your elected officials and hold them accountable to the unsafe conditions on our city streets.

Transpo Maps is a fiscally sponsored project of Seamless Bay Area Alliance, a 501(c)(3) non-profit. Your donation is tax deductible to the extent permitted by law.

Transpo Maps was created by Stephen Braitsch in April, 2022. Stephen has been fighting for safer streets and sustainable transportation since he went permanently car-free in 2008. In 2019 he designed and built Safe Lanes, an app that makes it effortless to report drivers for illegal parking and in 2020 he launched The Bike Match Network which has connected over 300 essential workers with free bikes during the pandemic. Stephen has volunteered countless hours with pedestrian and cyclist advocacy organizations across the Bay Area and beyond and has served on the Board of Directors of the San Francisco Bicycle Coalition.
Transpo Maps in the News
The Frisc
Muni Spends Millions On Street Projects. Is San Francisco Getting Results?
Muni Spends Millions On Street Projects. Is San Francisco Getting Results?
One transit activist says the city and its voters deserve to know whether big changes make streets safer, buses faster, and neighborhoods livelier.
New data shows why cars should be banned from Telegraph Avenue.
New data shows why cars should be banned from Telegraph Avenue
An analysis of vehicle crash data and demographic data from the U.S. Census exposes the inequity of allowing people to drive on Telegraph Avenue.
Rafael Mandelman
If it feels like there is no traffic enforcement in San Francisco, it’s because there pretty much isn’t. Traffic citations plummeted 97% between 2014 and 2022, with SFPD issuing only 10 citations per day last year. 🧵
S.F. supervisor wants police to ramp up enforcement of these five traffic violations
An analysis last fall by city resident and safe streets advocate Stephen Braitsch found the Police Department’s traffic division issued a combined 10 citations per day in 2022
Heather Knight
My latest column: San Francisco’s safe street advocates have long suspected the SFMTA prioritizes revenue over safety in ticketing parked cars. Now there’s data to back it up. Just 5% of citations go to cars blocking bike lanes, sidewalks and crosswalks.
The real problem with S.F. parking tickets: Most don’t go to dangerous drivers
New data confirms what safe street advocates have long assumed: : The San Francisco Municipal Transportation Agency prioritizes revenue over safety in deciding when to slap drivers with fines.
San Francisco Chronicle
JUST IN: A new analysis of traffic crashes on 14 Slow Streets, that the SFMTA’s board will consider making permanent at Tuesday’s meeting, shows that crashes on those streets have dropped by 61% since their implementation, compared to 20% citywide.
Data shows traffic crashes have dropped on most S.F. Slow Streets. Here’s by how much
The data analysis examines the number of crashes for an equal amount of time before and after the implementation of 14 Slow Streets.
Stephen Braitsch
Thank you @GasiaKTVU for inviting me to share my research & perspective on how we can make San Francisco's streets safer by NOT adding more cops. TL;DR we need citywide automated speed enforcement & street design that forces drivers to slow down!!
Safety concerns on San Francisco streets
An analysis of SFPD traffic enforcement data shows that 45 officers wrote just 10 citations per day in 2022.
Luke Bornheimer 👨‍👧
San Francisco has a car-related death and injury crisis. One of our only tools—enforcement of traffic laws—is ineffective and nearly nonexistent. If we want to achieve #VisionZero, SFPD needs to be more effective. An op-ed / thread on how they can do it 🧵
The San Francisco Police Department must do a better job of reducing car-related deaths. Here’s how.
Organizer Luke Bornheimer and data analyst Stephen Braitsch on the ineffectiveness of SF's traffic law enforcement.
Stephen Braitsch
🚨 New Research! 🚨 I analyzed every traffic citation the SFPD has written over the past 5 years and crunched the #s. Not only are they writing just 10 tickets a day, they're also disproportionately targeting BIPOC for non-life-threatening violations. 🧵👇
San Francisco, CA – SFPD Traffic Enforcement Analysis
SFPD is writing just 10 tickets per day and is disproportionately targeting BIPOC communities for non-life-threatening violations.
Heather Knight
My latest column: 45 cops work in the San Francisco Police Dept's traffic division. Together, they're issuing just 10 traffic citations a day -- a plunge from 74 citations a day three years ago. "What exactly are they doing?" asked a safe streets advocate.
"What exactly are they doing?" 45 S.F. traffic cops issue just 10 citations combined a day
Dangerous driving in SF is prevalent, but SFPD issue just 10 traffic citations a day.
San Francisco traffic fatalities in 2022 are outpacing deaths in 2021, as citations for traffic violations fall to their lowest level in three years. via @Jerold_Chinn @SFBay
Traffic deaths in San Francisco rise as citations plummet
A new map tracks traffic fatalities across the city
Streetsblog SF
New Website Puts Faces to Traffic Violence Numbers via @StreetsblogSF
New Website Puts Faces to Traffic Violence Numbers
Mapping the Tragedy of San Francisco's Streets
The San Francisco Standard
230 people have died in traffic accidents in San Francisco since 2014, including 27 last year alone. Safe streets activist @braitsch mapped those traffic deaths to commemorate the lives lost and to put pressure on the city to do more to prevent them.
How Dangerous Are SF’s Streets? New Map Pinpoints Traffic Fatalities
The cartography of crashes aims to honor those killed by cars while holding the city accountable.
The Bold Italic
@braitsch's car-ownership map of San Francisco is *chef's kiss.*
Someone Just Put Together a Car Ownership Map of San Francisco
There's a clear correlation between affluence and having reason to apply for a driver's license.
Stephen Braitsch
San Francisco is saturated w/ cars. 472,409 to be exact. They are everywhere, but where do they actually live? I pulled data from the DMV and U.S. census and put it on a map. Let's take a look. 👇🧵
San Francisco Car Ownership Map
SF car ownership mapped to census tract data
Streetsblog SF
Valencia Bike-Lane Violations by Paint and Numbers via @StreetsblogSF
Valencia Bike-Lane Violations by Paint and Numbers
Citing vehicles for illegal parking is a necessary, short-term solution but each of these corridors desperately need fully protected bike lanes their entire length as soon as possible.