Use our calculator to see the casualty and financial benefits from implementing 20mph in your Local Authority.
Use the link below to access the calculator. Choose your Local Authority from the dropdown list to see the potential cost to implement 20mph, likely casualty reductions and financial benefits. The number of casualties uses 2023 estimates from the DfT's collision tool. Casualty cost and population estimates are obtained from other UK government sources. More details in the "About" tab.
Cost and benefit estimates are based on experience from Local Authorities that have implemented wide area 20mph schemes, as follows.
| a) cost per person to implement (£7.50) | Evidence from across the UK is that 20mph costs £5 - £10 per person. Processes in some Local Authorities may increase this cost. |
| b) %age of streets covered (90%) | 20mph is appropriate on around 90% of streets in a location. In Local Authorities that have already implemented 20mph widely may see lower costs and fewer benefit |
| c) casualty reductions (25%) | Assumes wide area implementation, including 20mph on faster streets, where most casualties occur |
Download the calculator tool here
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