Webster and Mackie (1996),4 UK | General population | 20 mph zones in 200 residential areas | Before and after study | (A) Accidents | (A) 61% reduction in total injuries. |
| | | | (B) Speed Data | 70% reduction in child pedestrian injuries |
| Road environment | Traffic speed reduced by physical measures | (A) 72 schemes: accidents | | 48% reduction in child cyclist injuries |
| | | (B) 32 schemes: speed data | | (B) Speeds reduced by 9 mph from 25 mph |
| | | (C) 6 schemes: public acceptability to 16 mph | | |
| | | | | (C) Public reaction favourable Effective Good/reasonable evidence |