In France in the Alsace region, the Gendarmerie have come up with a new "game". They place two radars on the same road, separated by about 2 kilometers. The road is limited to 70 kph.
When you speed through the first radar, you get stopped, and chewed out. They'll tell you that you have been naughty, and make you feel real shitty, but they will not fine you. So they send you off on your way.
But if you get caught again by the second radar, then all hell breaks loose. Then the cops throw the book at you, and you will get the maximum fines.
In fact, as speed traps go, this one is more honest. They do give you a second chance, but if you are a dope, and start speeding again because you think they are no longer there, then it's your own fault, and you richly deserve the fine. And maybe with a big cell-mate called Bubba who hasn't seen a woman for 30 years.