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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