Waze is a crowd sourced traffic app available for all smart phones. It will alert you to police, traffic, objects in the road, rain, accidents, cars on the shoulder, and probably some other things that I just haven’t run into yet. We missed the sudden slow down on 75 south because of a tire in the left lane. (We knew far enough in advance to move over.) We also pulled the dog’s head in from the window right before the rain started. (Narrowly missing being trapped in the car with a wet labrador.) We knew exactly where the police were. (No comment. I NEVER speed….) I might be the app’s biggest fan.