The lack of a nationwide standard and extensive officer discretion lead to inconsistent data when it comes to traffic crashes and fatalities.

On the heels of "an explosive Washington, D.C., study that showed police had failed to record as much as 30 percent of 911 calls about drivers striking pedestrians, bicyclists, and other road users, with crashes going unreported most often in Black and brown neighborhoods," reports Kea Wilson. Advocates in Washington, D.C., for example, "say that as much as 40 percent of crashes in mostly Black areas may go uncounted — so District leaders may not even know where its most dangerous corridors are, much less have the specific data they need to fix them."
This underreporting of crashes, writes Wilson, "isn’t the only reason why U.S. communities don’t have a full picture of our national traffic-violence epidemic." Other important factors include: the lack of a federal crash-reporting standard; the flawed standard currently recommended by the National Highway Traffic Safety Administration (NHTSA), which omits important details such as "how far a walker who’s struck by a driver might be from the nearest unobstructed crosswalk" and vehicle height and weight; and the amount of discretion officers have in choosing what information to collect and report.
Rohit T. Aggarwala, senior fellow at Cornell Tech and author of an op-ed encouraging Secretary Buttigieg to reform the Fatality Analysis and Reporting System (FARS), "hopes that, with the right reforms, much subjectivity can be stripped from crash reporting" so cities can have more accurate data when making Vision Zero plans.
FULL STORY: Why U.S. Car Crash Reporting Is Broken

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San Diego to Rescind Multi-Unit ADU Rule
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Urban Design for Planners 1: Software Tools
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City of Albany
UCLA Lewis Center for Regional Policy Studies
Mpact (formerly Rail~Volution)
Chaddick Institute at DePaul University
City of Piedmont, CA
Great Falls Development Authority, Inc.
HUDs Office of Policy Development and Research