[QUOTE] This is far more scary: [URL]http://www.timesonline.co.uk/tol/driving/article4909662.ece[/URL][/QUOTE] This is interesting ...."On the M1 the number of casualties halved after average-speed cameras were introduced on a contraflow between junctions 6a and 10." considering that there was never a time during the contraflow when there were no specs cameras, the only alteration has been to increase the limit from 40 to 50, perhaps thats when the reduction took place. Also I can't see how it would work if it's spread over roads with different speed limits.