Its a good concept and gameplay is good too. There should be some more cities for patrolling. Some times the cars pass through the buildings, which is not at all convincing. And in one particular situation, the criminal car was not visible either on map or in city. There might be some bugs lurking which might be putting the car far away. But the overall design is good and can be enhanced by implementing some day-night, and weather effects. Also there should be a camera tilt and pan so that player can adjust the camera more easily. There can be key bindings for selecting the 1,2,3,4 car, which will make player more involved.