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Determining safe speeds
Road Safety Foundation (10.6.25)
The safety impacts of 20mph speed limit introduction on borough roads in London, 1989 – 2013
Transport for London (28.5.25)
20 mph speed limits and zones: public health impacts
Parliamentary Office of Science and Technology (20.05.2025)
20’s the limit: How to encourage speed reductions
Wales Centre for Public Policy (22.4.25)
Police recorded road collisions (in Wales): July to September 2024 (provisional)
Welsh Government (5/2/25)