Help Forum

Help requested posted on 9th September 2019:

Collision reduction scheme studies examples and best practice

Following a recent query on here relating to collision reduction schemes and how we derive the costs using old Oxford Data showing percentage savings when a proposed remedial measure is implemented, I'm not sure we've fully answered the query.

As such, I've put this question to some Road Safety Data analysts and they are keen to investigate the matter further. They have asked for a wish list of what we would like to see to help deliver casualty savings so please respond or contact me by E mail with any suggestions. If anyone would be willing to share any 'Collision Investigation Studies' Road Safety Studies' or Engineering Safety Studies' with me to ensure best practice in the meantime that would be hugely beneficial. I would also be more than happy to share our Studies as they tend to be readily available as they're occasionally used as examples by Local Authorities. Many thanks.

Paul McKenna

Reply to this request

Response posted on 11th September 2019 by:
Neil Thorpe


Collision reduction scheme studies examples and best practice

I would like to think that ‘best practice’ recommends that confounding factors, notably regression to mean and general trend, are accounted for appropriately in any before/after-type evaluation of a collision reduction scheme. If not, there is the real risk of calculating mis-leading estimates of scheme effects and value-for-money. When presenting before/after collision data in reports etc., it should always be stated if and how these confounding factors have been accounted for to enable the proper interpretation of a scheme’s effectiveness.

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