Why Don’t The Boston Police Report Traffic Crash Data? (Vision Zero Watch)

Every year, the Massachusetts Department of Transportation publishes a list of the 200 most dangerous roadway intersections across the commonwealth.

But for years those reports, and the data that underlie them, have had a gaping hole — one the size of the city of Boston: Unlike every other municipality in the state, Boston’s police department does not collect and submit standardized traffic crash data to state officials.

Even as the city of Boston pursues its Vision Zero plan, announced by Mayor Marty Walsh in 2015 — with the goal of ending traffic-related fatalities and serious injuries by 2020 — the commonwealth’s largest city has yet to comply with basic data collection and reporting practices followed for years by other towns and cities across state.

And when it comes to Boston, the numbers in question are alarming: In recent years, the city has seen an average of more than 20 traffic-related fatalities and crashes, injuring between 700 and 800 pedestrians and between 400 and 500 bicyclists, per year.