Most fixed cameras are easy to spot nowadays anyway. Likewise mobile traps at the side of the road. The only things you cant guard against are laser and a follow check. Theres nothing you can do about a policeman in a patrol car doing a follow check on you, as I found out when I just got banned for 28 days. As soon as your detector gives a laser warning, its already too late, laser does an instantaneous, almost perfectly accurate reading, which you cant dispute in court. The only way to protect against laser is to have a laser jammer.