Aren't these the devices that flash the speed limit or bend sign and say "slow down". Didn't think they recorded your number. In Surrey they often have scameras hiding down the road after one of these signs -nearly didn't see one near Esher....
No, they are Class 1 rated. Although the impulse power is very high, the pulses are extremely short; on average there emit about 5% of the power of your typical TV remote control.