When they are doing a leap frog type sting it is no more than revenue generation IMO. I got one of these in Dublin Ga one time and it cost 275.00. The law had barely gone into effect and I had never heard of it. He told me ignorance of the law was no excuse. :-) They had 1 cop car just pulling one over and then giving the reigns over to the next cop car and on and on. I don't disagree with the law and there was a problem with officers getting killed or injured but I think it's naïve to think that the almighty dollar is not being generated with this as the excuse/reason.