The command creates an invisible officer behind the car who starts redirecting traffic. When you move the car without deactivating that command the invisible officer stays behind and keeps redirecting traffic and worse, blocks other units. So I suggest you do not even try to alter the script before you also start complaining that it does not work. Like other people, I also do not see a reason to redirect the traffic while the car is moving (?). All emergency vehicles already drive faster than civilian cars. Each time an emergency vehicles passes a car, you want that car to get redirected? That will CERTAINLY cause problems with the oncoming traffic on the other lane(s). There is no such thing as a smart AI in this game. vehicles just start blocking each other... Looks like you haven't really thought about this.