You have to include in your calculation the cost of not enforcing it and the accidents/injuries/deaths resulting. Then there's all the people cops would shoot after they are assaulted by drivers pissed off @ being caught. Seats have sensors for the airbags could block phones unless the passenger sensor is triggered. Idiot drivers don't just occasionally make a mistake. if you continue watching them it's a constant theme. Like the middle aged asian lady in a minivan this morning: She pulled out from a stop sign in front of a car that had to hit their brakes, she went around a non blind curve fully on the opposite side of the road with a car coming around the curve in the opposite direction, then she swung wide into the opposite lane on a right turn at the next intersection.