There have been a few anomalies in this area, at least two cameras are in places where there has never been an accident and the mobile units caused a lot of complaints. There was one spot especially where it was just around a bend past the 30mph signs, no houses and very rarely pedestrians and the van was there a couple of times a month, again no history of any accidents, not even minor. Freedom of information revealed that over a 5 year period the vans had been deployed on the 50 mile stretch of A road north of that location only few times despite there being multiple accidents and a couple of fatalities. There never was a coherent answer to that so go figure!
Note before anyone jumps in, I've already said there's no excuse for speeding but Is it any wonder the safety argument is sometimes met with disbelief..