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This research aims to evaluate the effects of road diets on motor vehicle crashes and injuries.

Evaluation of Lane Reduction “Road Diet” Measures on Crashes and Injuries

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This research aims to evaluate the effects of road diets on motor vehicle crashes and injuries.
Analyzed data from 12 road diets and 25 comparison sites in California and Washington cities.
Used a before-and-after analysis with a yoked comparison design.
Applied a negative binomial model to adjust for traffic and other influencing factors.
Crash rates decreased by about 6% after road diet implementation compared to matched sites, without reaching significance.
No significant treatment effect on crash severity between road diets and comparison sites was observed.
Differences in crash type distributions were seen, but no variation between before and after periods.

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Randomized trial evaluates road diet impact on crashes and injuries in California and Washington, suggesting cautious implementation.

Huang et al. (2002) studied this question.

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