As a car simulator I think it's nice to get some normal AI cars drive along on the streets like we do on real life? Although it could be very "lag" doing so, I still think it's very nice to have other fellow car drivers drive along.
AI cars are currently broken, but if you get the full game you can spawn another car, switch to it with tab, and then switch back to your normal car while accelerating, resulting in the throttle getting "stuck on." Happy chasing!
That would be pretty cool, but it would be very difficult to have and keep the fps at a playable level.