Speed limits of 20 miles per hour have seemingly little impact on crashes, casualties and driver speed

Focused chemists in lab coats and safety goggles making experiments.

Restricting speed limits to 20 miles per hour (mph) in town and city centers doesn’t seem to reduce road traffic collisions, casualties, or driver speed, finds a 3-year study of its rollout in one major capital city, published online in the Journal of Epidemiology & Community Health.

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