First Aspect
Legendary Member
My guess would be that they are defining 'speed cameras' as ones that are generating fines, and that data is either coming from them once not collecting fines, or that they are collecting speed data by other means to judge the outcome of turning off the fine generation function. It's not surprising that people who are likely to speed are more likely to do so if they know they are unlikely to be caught.
It is interesting the general downwards drift while they certainly were operational... it does suggest that those likely to speed will, over time, adjust their behaviour, if there are penalties.
It will be the army of retirees hanging around the entrance to villages wearing high vis and holding speed guns. They are everywhere.