It looks as though 'Specs 3' average speed cameras will be rolled out on rural and major urban roads. Drivers' journey details will also be kept for 5 years in yet another sinister 'big brother' policy. Specs will not be targeting accident black spots, but will track drivers and measure the average speed of vehicles over tens of miles. This is in part an admission that drivers brake briefly through Gatso cameras and then speed up again. The national average speed limit reduction through conventional speed camera sites is only 2.2mph, and 1mph in Staffordshire. The belief is that a 1mph reduction in average speed reduces casualties by about 5%, but this has been shown to be statistical manipulation in order to avoid using the scientific '85th percentile' method of setting speed limits.
The Times: Drivers will have no escape from new speed cameras
ABD; TRL 511 - The need for speed reduction
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