Who's at the Wheel?

I red an amazing story. It was about a city where there was a lot of traffic, the name of the city was Chevy Chase, Maryland, and some people drive too fast there. They step on their brakes and slow down on Newlands Street, though. This is because they see a police car with a police officer inside. The man in the car is named Officer Springirth. He has worked on this street 24 hours a day, seven days a week, for 3 years. How Officer Springirth do this? - He isn’t a real man. He is a mannequin.
When the police department put Officer Springirth on the street there were no more breaks- ins in that area, the crime rate in Chevy Chase is very low and the most important effect Officer Springirth has is reducing traffic accidents. People who see him are fooled. He looks exactly like a real police officer, as he sits at the wheel of his car wearing a cap and sunglasses. But people who call him for help are in troubles. Officer Springirth can’t help them- he doesn’t have any legs. I think that is a very smart idea.