If a pedestrian is struck by a vehicle at 20mph they have a 97% chance of survival. This reduces as speeds rise. Speed is the main cause of premature deaths and injuries in road casualties with older people and children being most vulnerable.
20mph zones result in a 40% reduction in casualties and 50% for children, and according to the Royal Society for the Prevention of Accidents speed humps are the most effective way to enforce 20mph speed limits.
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