Empty cop cars

I guess the San Antonio police are responding to the rash of recent accidents along loop 1604 (aka the "Death Loop) on the north side of town. I also suppose that they must have a bunch of cars laying around that they're not using because they're putting empty cop cars in the median to slow people down. What they don't realize is that people aren't getting in accidents because they're speeding...they're getting in accidents because they're either stupid or because the person in front of them slams on their brakes and they're too busy chatting on the phone.