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Safer Intersections Project a Traffic Calming Success
By Uyen Ngo
This week the San Francisco Municipal Transportation Agency (SFMTA) released “A Turn Toward Safety: The Safer Intersections Project,” a report detailing the impact of the Left Turn Traffic Calming Project and the “Safety—It’s Your Turn” education campaign. The Safer Intersections Project now has tested traffic interventions that can reduce unsafe left turns. Overall, SFMTA found a 17% reduction in average speed (1.7mph slower) and a 71% reduction in the likelihood of a car turning left at higher speeds over 15mph at seven high-crash test intersections.
In 2019, 40% of traffic deaths in San Francisco were caused when drivers made left turns and didn’t see the person in the crosswalk, until it was too late. To combat this trend, also seen in other cities, and encourage safer left turns and adoption of safer left turn behaviors, San Francisco’s multilayered project combined engineering treatments in seven high-crash intersections with an education campaign, which led to promising results.
The Left Turn Traffic Calming Project consisted of installing waist-high vertical delineator posts, small rubber speed bumps, and paint to create enhanced center lane lines and painted safety zones to encourage slower, wider left turns and increase drivers’ awareness of other road users. To measure the impact, SFMTA collected left-turning driver speeds before and after installation and then compared driver speeds at the seven project intersections with four other control intersections. The result of this project showed that these treatments are proven to slow driver speeds and encourage safer left turns for both people in the crosswalks and opposing traffic.
The second part of the Safer Intersections Project was designing and implementing an education and community outreach campaign– “Safety—It’s Your Turn” –funded by a $2 million grant through the California Transportation Commission Active Transportation Program. The campaign presented three safer left turn behaviors (Take it slow—5mph is safest; Make it square—90-degree angles are best; and Stay aware—look out for cars, cyclists, and people) and data suggests the “Safety—It’s Your Turn” campaign extended the speed reductions from the Left Turns Traffic Calming project. Year-to-year survey results also show that public perception of the dangers of speeding is trending in the right direction, indicating a sustained change in attitudes influenced by education campaigns and engineering.
A unique aspect of this project was the use of behavioral science. SFMTA partnered with the Behavioral Insights Team (BIT), a leading behavioral science organization, to analyze how drivers make left turns in order to develop interventions that would prompt safer behaviors. By changing the architecture of intersections, we were able to move people toward making safer left turns in the moment. The combination of these physical changes and SFMTA’s educational campaign encouraged safe driving behaviors and increased awareness of how individual actions have an impact on the community.
The education campaign also included working with community-based organizations (CBOs) to broaden and deepen the traffic safety messaging. Through a community grant process, six CBOs were compensated for their time and knowledge, creating additional materials and events supporting the campaign. Many of our grantees were new to Vision Zero and helped us reach additional residents through creative ways such as food delivery, artistic public service announcements, virtual bike rides, and youth poster contests. Finally, we worked with an additional eight CBOs to share educational materials and present the Safety—It’s Your Turn campaign to their members.
In addition to the treatments’ impact on slower speeds, there were two key takeaways from the project:
- Well-funded and evidenced-based education campaigns are an important and effective tool in in raising public awareness, encouraging safer driving behaviors, influencing policy discussions, and building community support.
- For maximum effectiveness, calming treatments should become a standard engineering tool and applied at locations with existing high left-turn speeds, conducive street geometry, and lots of people walking and biking.
Published November 19, 2021 at 05:28PM
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San Francisco Announces Bold Commitment to Safer Streets
By Ryan Reeves
This week, San Francisco Mayor London Breed released the 2021 Vision Zero Action Strategy—our City’s multi-agency framework for eliminating traffic deaths and reducing severe injuries.
The City and County of San Francisco committed to ending traffic fatalities through Vision Zero in 2014. Since then, our approach has continued to evolve – we've incorporated new strategies and expanded on existing and successful programs. In this updated plan, we commit to bold and ambitious strategies to create safer streets. We will double down on redesigns to make streets safer for people, and expand programs like our Vision Zero Quick-Build across the city’s High Injury Network (HIN), the 13% of city streets that account for more than 75% of severe and fatal injuries.
The Vision Zero Action Strategy lays out a clear path for the city towards this ambitious goal over the next three years. The strategy focuses on slowing speeds and safer crossings. More than 80 miles of our city’s High Injury Network have been upgraded or are in construction with core safety improvements. This strategy commits the City to expand the successful Quick-Build initiative to cover the remaining 80 miles in the High-Injury Network. As part of this effort, we are committed to adding daylighting and high-visibility crosswalks to every intersection along the HIN. We will also update all eligible signals to give pedestrians head-starts and more time for crossing the street. The strategy also commits us to updating our City’s Active Transportation Network, connecting car-light/car-free streets to protected bike lanes by 2024. Through these design changes, we can make walking, biking, and taking transit safer and more accessible for San Franciscans.
This strategy shows how policy change can make a significant impact in expanding our tools for safer streets. Under the recently passed AB43, which gives cities the authority to lower speed limits along certain corridors, San Francisco will begin implementing 20 mph zones along key streets as early as next year. We will also develop and implement a comprehensive speed management plan, including education and outreach to advance a culture of traffic safety. Lowering speeds by even 5 mph can make a significant difference for safety: We have seen from peer cities like Seattle that implementing 20 mph zones can decrease collisions by around 20%. We will also continue to push for policies like congestion pricing that incentivize mode shifts away from driving and toward active transportation and public transit.
As we begin to implement the new Vision Zero Action Strategy, we are keeping equity core to our focus. The Vision Zero HIN is disproportionately concentrated in San Francisco’s communities of color, and vulnerable people—including seniors, people with disabilities, unhoused populations, and people of color—face the greatest risks from traffic-related injuries and deaths. Our Action Strategy prioritizes these communities in engagement, education, and implementation of Vision Zero programs. This past year, we rolled out 20 mph speed limits throughout the Tenderloin, where every street is on the High Injury Network. We are also focused on pursuing legislative authority for new strategies, like speed safety cameras, that are effective in reducing crashes and can reduce racial bias and disparities in enforcement.
This updated strategy commits to bold and ambitious action to get us closer to zero traffic deaths. But to achieve Vision Zero for San Francisco, we know we need the full force of comprehensive policy change, political buy-in, and community support. We need a citywide investment toward lasting, monumental change for our streets. Getting to Vision Zero will take sustained, cross-cutting, and continually innovating action. We’re committed to ending traffic deaths and reducing severe injuries in the city—and will work urgently to save lives on our streets.
Published November 18, 2021 at 11:07PM
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El Arte de la Fotografía: Capturando Momentos Eterneles
El Arte de la Fotografía: Capturando Momentos Eterneles Entendiendo la Fotografía La fotografía es una forma de expresión artística que perm...
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Watch video on YouTube here: https://youtu.be/PzDZWY6mgGg
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Watch video on YouTube here: https://youtu.be/3tGZ-bSpFWE
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Watch video on YouTube here: https://youtu.be/ntljnJmlIv0
