Rock Springs is a heavily traveled back or cut though road. The speed limit is 30 MPH (should be 40-45) the entire length. The cops to back into an empty lot in a curve and shot radar. The main road through Smyrna is Murfreesboro Rd (41/70) and I have seen the cops parked at each traffic light waiting on someone to speed up or run the lights (I have seen at least five cars parked at five different lights at the same time).