What are the cars for that sit at stoplights/intersections?

Question

The sit up on the shoulder or on the median, all different kinds of cars and they all have a magnet on the door with a picture of a traffic-stop light. I live in Charlotte, NC, dont know if they are just here but I really want to know.

Answer 1

Maybe to remind you that you ARE sitting at a stop light.  You don't have to sit there.  It costs money.  You burn 20% less fuel starting a car moving from 5mph than from a complete stop.  So pay attention and slow down for the next light so you can roll through after it turns green!