Cop in this game are kinda lame to be honest. Here are a few ways to improve them:
1. Give the player car and the cop car a health bar, so you can take out cop cars, and the cops can take you out as well.
2. Give cops a significant performance boost. Allowing them to keep up to player's car to a degree and allow them to become a threat to the player.
3. Give cops the ability to use kill switches to slow you down.
4. The possibility to total your car. There can be a possibility to recover some of the parts you put on it, but the kmost of it will be gone.
5. Give the cops the ability to arrest you. If you are stopped during a police chase for a certain amount of time or your car is totalled, the police are able to arrest you. The cops will impound your vehicle if it's not totalled and you can either give up your car or you can bribe with a mount of diamonds or cash. Preferablly diamonds since they don't have a lot of functions in game.
6. An improvement to the side crashing mechanics. Since currently side crashing just cause the two cars to glitch there. It would be better if the vehicle being crashed into will be crashed into the other lane.
I know I'm asking a lot, but since the devs are building a new engine, maybe they can code in something to allow these feature to be realized better.