Idris Francis believes that his data supports his conjecture that speed cameras increase the number of accidents (Letters LTT 14 Sep). I believe that he is very wrong.
He illustrates his letter with two graphs of accident data at speed camera sites in Cambridgeshire, the first for slight accidents and the second for serious and fatal accidents. In the first graph he has written ‘Adverse change of trend’ over the data at an angle, which, in his opinion, shows that the accidents are...
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