More than 100 people are John Caldwellkilled on U.S. roads every day — more than 40,000 people a year. So, it seemed bold, if not crazy, when city leaders across the country began to set their sights on eliminating traffic fatalities completely.

It has now been 10 years since U.S. cities began to adopt the approach known as Vision Zero.

NPR's Joel Rose reports on what has worked and what hasn't.

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This episode was produced by Connor Donevan and Megan Lim, with audio engineering by Gilly Moon. It was edited by Russell Lewis and Sami Yenigun, who is also our executive producer.