Local Transport Today is the authoritative, independent journal for transport decision makers. Analysis, Comment & News on Transport Policy, Planning, Finance and Delivery since 1989.

Road safety: can we regress to a meaningful mean?

Alan Young, Senior technical director, WSP UK Birmingham B5
07 December 2012
 

I read with interest the article in this week’s LTT by Andrew Forster on road safety and the interpretation of data before and after the introduction of speed cameras (‘Road safety: time to rethink how we assess interventions?’ LTT 23 Nov). In particular I was drawn to the use of regression analysis. This is not because I am a whizz with stats – far from it, indeed, my ignorance knows no bounds – but rather the idea that there can be a mean with such varied...

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