 So, first, there has to be a supervisor there to oversee the conduct of all of the people to make sure that the rules are adhered to. Motorists, number two, motorists have to be stopped in a neutral manner. So, as the cars are going through the checkpoint, maybe it's we stop every third car. And the reason we stop the cars, it has to be neutral based upon number. It can't be, well, we're going to stop the guys in the Nova car.