Casualty cost and 20mph benefit calculator

Use our new calculator to see the casualty reductions and financial benefits from implementing 20mph for your Local Authority or for England, Scotland or Wales as a whole. 

Click on the link below to access the spreadsheet.  On tab "Local Authority calculator", choose your Local Authority from the dropdown list to show the potential cost to implement 20mph, the likely casualty reductions and the financial benefit.  The number of casualties has been downloaded from the DfT's website using the DfT's data download tool.  Cost of casualties and population estimates are obtained from other UK government sources.  More details are in the "About" tab on downloaded file.

On the "Whole Country calculator" tab, you can see the costs for England, Scotland or Wales as a whole for those Local Authorities that have yet to implement 20mph. 

Estimates of the cost and benefits are based on experience from Local Authorities that have implemented wide area 20mph schemes.  The tool allows you to input your own variables:

a) the cost per head to implement Evidence from elsewhere is it should cost no more that £3 - £5 per head. Processes in some Local Authorities may increase this cost.
b) the %age of streets covered It is unlikely that everyone in the Local Authority will live on a street suitable for 20mph and 80% is selected as the likely maximum. Some Local Authorities may have already implemented (or be reluctant to implement) 20mph widely and fewer people will be covered.
c) the casualty reductions achieved While some Local Authorities have seen a bigger reduction, others that won't implement 20mph on faster streets, where most casualties occur, will see a lower benefit.

The calculator tool is here

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