If these cops are using radar speed guns then there is tech that eliminates the dopler effect that these guns use to calculate the speed of an object, i have seen this device in kiash land, it consists of an antennae mounted within the grill of the car and a control unit, it works by absorbing the radar signal sent by the speed gun resulting in a zero reading from the gun. this is illegal in kiash land and guys have served serious time for this(crafty Kenyans take note).
In the alternate, the relevant authorities should set up automated speed cams so that people can invest in tom toms that warn you early to slow down if you are approaching an area where there is a speed camera
'One headache for famous medieval holy people was that someone might murder you to acquire your body parts for the relics trade'