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Assumptions over speed camera stats are fatally flawed

Idris Francis Petersfield Hampshire GU32
12 October 2018
 

“The updated analysis” which the Cambridge authorities state “has resulted in strengthening our recommendations to upgrade our safety camera network” (LTT 28 Sep) remains seriously flawed because its estimate of “normal” pre-installation levels of Fatal and Serious Collisions  (FSC) includes totals which are clearly abnormal.

For the 31 sites providing data at least 10 years before installation, the totals for successive years are 34, 32, 31, 48, 53, 25,...

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