Does anyone know if they are actually speed cameras, just seems a bit low down to get a proper indication of speed let alone a clear shot of the vehicle reg or driver.
I find it more believable that they are some sort of traffic management system.
I think what the OP is saying that they are used in Europe but are being trialed in the UK. How long will it take for roadside vegetation to cover that 
I’ve heard its to photograph truckers who take a dump in a lay-by 
redbob:
I’ve heard its to photograph truckers who take a dump in a lay-by
And which RDC were you in when you heard that ?