Professor Allsop’s estimates of the benefits of speed cameras on cutting collisions fail on at least four counts the ‘Does it make sense?’ test that I have applied to everything since my knuckles were rapped in Form 3 Maths (‘Speed cameras do cut collisions, says academic’s new guide’ LTT 14 Jun & Letters LTT 12 Jul). They are:
The estimates far exceed the total (likely or possible, primary and secondary) contributions of speeding to accidents...
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