Road Diet Crash Reduction Variations Studied By DOT

This 4-page summary report (PDF) is a summary of a technical paper attempting to show differences in the reduction in road crashes that result from road diets.

From the study: "A road diet involves narrowing or eliminating travel lanes on a roadway to make more room for pedestrians and bicyclists. (They) are often conversions of four-lane, undivided roads into three lanes-two through lanes plus a center turn lane."

The study was conducted in California, Washington and Iowa:

"The Iowa data indicate a 47 percent reduction in total crashes while the HSIS (California and Washington) data indicate a 19 percent decrease-a substantial difference."

It's clear from the results that road diets do reduce crashes - the only issue appears to be just how great a reduction.

Thanks to Transportation Research E-Newsletter

Full Story: Evaluation of Lane Reduction "Road Diet" Measures on Crashes

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