Double-Teardrop Roundabouts Slash Traffic Injury Crashes, New Study Shows

A unique roundabout design called a double-teardrop, also known as a “dogbone” interchange, reduced injury crashes by 84% at busy intersections in Carmel, Indiana, and lowered all crashes at these locations by nearly two-thirds. Double-teardrop interchanges combined with more conventional roundabouts cut injury crashes in half.

Those are the highlights of a new study recently released by the Insurance Institute for Highway Safety, a non-profit financed by the insurance industry. 

“Our results show that Carmel’s double-teardrop roundabouts are remarkably effective in preventing the most severe crashes,” Jessica Cicchino, the Insurance Institute’s vice president of research, said in a statement. “The main reason is that their design allows them

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