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

Good data trumps statistics for speed camera analysis

Francis Petersfield Hants GU32
28 September 2018
 

Cambridgeshire County Council is quoted in LTT saying that Professor Richard Allsop’s method for assessing the effectiveness of speed cameras gives a “conservative estimate of effect as a peak in collisions (the site selection period) is removed from the data set” (ibid). In doing so, the council adds its name to the worryingly long list of decision-makers who understand neither site selection bias nor regression to the mean, the real problem being that consistent failure to...

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