Another comment on speed cameras
The cause (From my reading at least) appears to be quite self evident. Drink driving is way down and no longer as socially acceptable as it once was. Repeated Police purges on unsafe vehicles seem to be having a positive effect on the figures too. Better safety technology in vehicles. Better tyres and brakes. Better and more stringent MOT testing. By the look of the figures, Speed cameras have only had a marginal effect.
Don’t take my word for it; read them for yourselves.