If it was lowered down and being worked on I doubt it was in working order, they might have been testing it!
Plus, if you were going under the speed limit the lines on the road will show it when they measure it on the photos!
Dont worry!
Theres a camera near my way that if cars going the other way are going to fast it goes off and gets people on the correct side, if that makes sense! I have been caught like that before and never got anything through the door :)