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
Downtown Los Angeles Park Wins National Award
Vista Hermosa Natural Park, designed by the landscape architecture firm Studio-MLA, has won the ASLA 2023 Landmark Award. Completed in 2008, Vista Hermosa was the first public park built in downtown L.A. in over 100 years.
Norman, Oklahoma Eliminates Parking Mandates
The city made a subtle, one-word change that frees up developers to build parking based on actual need and eliminates costly unnecessary parking.
Boston Transit Riders Report Safety Concerns
Almost three-quarters of current and former riders report feeling unsafe while using MBTA services.
Prioritizing Equity in Federal Transit Funding
TransitCenter recommends several transit capital projects deserving of federal transportation dollars.
California Housing Bills Streamline Affordable Housing
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Growing Pains in Northwest Arkansas
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HUD's Office of Policy Development and Research
Mpact: Mobility, Community, Possibility
This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.