Actually it is worse than I thought. Figures are for Personal Injury Accidents per vehicle million km
effect on PIAs Road works open motorway
Analogue speed cameras 55% increase 31% increase
Digital speed cameras 4.5% increase 6.7% increase
Police patrols 27% reduction 10% reduction
These percentages are a simple calculation from the TRL data - for example the Analogue speed cameras at road works is:
0.138 / 0.089 = 1.5506 = 55% increase.
TRL report is TRL-595
www.safespeed.org.uk/trl595001.gif this is the table. The report itself costs money still I think.
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