Crash Data and Review
The Transportation Department uses certified crash data for formal analysis, reporting, and decision-making whenever available. The city's official crash data source is the certified Roadsoft crash database. Roadsoft incorporates crash reports from responding agencies, including: Ann Arbor Police Department, University of Michigan Police Department, Michigan State Police, Pittsfield Township Police Department, Washtenaw County Sheriff's Office, and Other responding agencies within the city.
Certified crash data generally becomes available approximately six months after the close of each calendar year. Certified Roadsoft data is used for official crash analyses, public reporting, safety studies, grant applications, engineering studies, Council communications, and published statistics.
Traffic Crash Data Explorer
Use this dashboard to explore frequencies and trends related to traffic crashes that have occurred on Ann Arbor roads in recent years.
Ann Arbor Crash Data 2021 - 2025
This crash data map contains a visual guide to crashes in Ann Arbor from 2021-2025.
Every City Investigates Crashes. Very Few Actually Learn From Them.
-Strong Towns looks at how Ann Arbor investigates crashes
". . . A few years ago, the city of Ann Arbor, Michigan, began to approach street safety and crashes differently. Like many cities, Ann Arbor adopted a Vision Zero plan with the goal of eliminating traffic fatalities and serious injuries. But they didn’t stop at just setting a goal. They built a practice around it.
As part of that effort, the city created a Crash Response Team: a standing, multidisciplinary group tasked with reviewing every serious crash. Not just documenting it, but reviewing each of these crashes to understand the contributing factors.
That distinction matters.
Instead of relying on a single report, the team brings together staff from different disciplines to look at each crash from multiple angles. They begin each review with the assumption there are multiple contributing factors. They examine not just user behavior, but the design of the street, the surrounding context, and the institutional decisions that shaped both.
The goal of this team is not to assign blame. It is to understand how the system behaved and where it failed.
When Ann Arbor invited Strong Towns to facilitate a Crash Analysis Studio workshop, it wasn’t because they lacked a process. It was because they wanted to strengthen one they had already built. That, more than any specific tool or methodology, is what sets them apart. . . "