Slow Cop

A woman was driving her old beat up car on the Highway with her 7 year old  son. She tried to keep up with traffic but they were flying by her. After  getting caught in a large group of cars flying down the road, she looked at  her speedometer to see she was doing 15 miles over the speed limit. Slowing  down, she moved over to the side and got out of the clump that soon left her  behind.  She looked up and saw the flashing lights of a police car. Pulling  over she waited for the officer to come up to her car. As he did he said,  "Ma'am do you know why I pulled you over?" Her son piped up from the back  seat, "I do... because you couldn't catch the other cars!"     