In this racing game first you have to learn how to drive your police car as you are going to explore San Andreas in search of criminals. So polish your drive skills and then head to the city and try to catch thieves as real GTA cop. You have to stop their vehicle to eliminate bad guy. Or you can blow it up - it's up to you!
Also in GTA Police you can customize you vehicle to make it more faster and more durable. Upgrade it and you will be able to work much better and stop more criminals.