When New York City launched the Congestion Relief Zone in January 2025, it became the first congestion pricing program in the United States—a bold experiment covering roughly eight square miles of Manhattan south of 60th Street, where vehicles pay between $1.05 and $21.60 per entry depending on vehicle type and time of day. One year in, researchers from Columbia University and Yale School of Public Health have published the first major findings: traffic crashes in the zone dropped 9.6 percent, with broader safety benefits rippling across the urban landscape.
The significance of this drop cannot be overstated. Before tolling began, the Congestion Relief Zone averaged 549 crashes per month. Six months after implementation, that number fell to 496—a tangible reduction in the collisions that kill and injure New Yorkers every day. The decline was driven largely by fewer non-injurious and non-fatal crashes, though even the more severe crashes involving pedestrians and cyclists showed improvement, albeit less pronounced than the overall decline. For a city that has spent more than a decade pursuing Vision Zero—its audacious goal of eliminating all traffic-related deaths and serious injuries—this data offers meaningful progress.
The reason for the crashes dropping at all offers a window into how congestion pricing reshapes the urban environment. Fewer vehicles in the zone means less congestion, shorter travel times, and cleaner air. It also means drivers move faster through the remaining traffic. This speed paradox reveals the program's limitations: while congestion pricing has proven effective in European cities like London and Stockholm, those cities pair the tolls with aggressive traffic calming measures—physical barriers, narrowed lanes, and lower speed limits that force drivers to slow down. New York's CRZ, by contrast, relies primarily on pricing alone, which may allow faster vehicle movement that partially offsets safety gains.
Christopher Morrison, associate professor at Yale School of Public Health, framed the findings carefully: "Crashes declined after the program began, which means safer streets for everyone who uses the roadways in lower Manhattan." His caution reflects the researchers' honest assessment. Lead author Nicole Itzkowitz of Columbia Mailman noted that "without the additional traffic calming measures often found in European cities, reducing traffic volume in NYC may allow drivers within the CRZ to travel faster, potentially increasing crash risks."
This is where the research points toward next steps. The authors acknowledge that congestion pricing alone is unlikely to achieve Vision Zero's ultimate goal of eliminating traffic deaths and serious injuries entirely. To truly move the needle on severe crashes, the city may need to layer in additional interventions: red-light cameras, physical traffic calming that forces drivers to slow down, expanded automated enforcement, and street redesigns that reduce aggressive driving behavior. The data also reveals that understanding how vehicle speed and traffic density interact remains crucial—research questions that will shape policy conversations in Manhattan and beyond.
For now, the first year of America's first congestion pricing program has delivered what early adopters hoped for: fewer crashes, cleaner air, and faster travel for those who remain in the zone. It's not the complete Vision Zero solution, but it's a measurable step forward, built on one year of evidence rather than speculation.