Casualty cost and 20mph benefit calculator

Use our calculator to see the casualty reductions and financial benefits from implementing 20mph for your Local Authority. 

You can access the spreadsheet on the link below.  On the "Local Authority calculator" tab, choose your Local Authority from the dropdown list to show the potential cost to implement 20mph, likely casualty reductions and financial benefits.  The number of casualties is based on 2019 figures using the DfT's data download tool on its website.  Casualty cost and population estimates are obtained from other UK government sources.  More details are in the "About" tab.

Cost and benefit estimates are based on experience from Local Authorities that have implemented wide area 20mph schemes.  The tool allows you to input your own variables:

a) cost per head to implement Evidence from across the UK is that 20mph should cost no more that £5 - £10 per head. Processes in some Local Authorities may increase this cost.
b) %age of streets covered As not everyone in the Local Authority will live on a street suitable for 20mph, 80% is selected as the likely maximum. Some Local Authorities may have already implemented 20mph widely and fewer streets and people will be included.
c) 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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