May I thank Paul Biggs (Letters LTT 19 Feb) for directing my attention to the DfT’s The Road Safety Good Practice Guide and its section that deals with Regression to the Mean (RTM). What the guide says is very interesting and is worth repeating here. In essence, the problem of RTM is most acute at sites where there are extremely high numbers of accidents occurring and where the camera selection period is short. It is even more acute should the selection period include particularly high...
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