It would probably be very hard to make a A.I that will allow a bot to control a vehicle efficiently. From what i have seen; the most common way that bots move from location to location by locking onto clients and following them around. I don't think this will be very effective with vehicles and they are most likely to end up going around in circles going nowhere and getting stuck. Also i do not see much point in it also. Yes it probably would be a thrill to see vehicles getting controlled by bots but it would quickly get boring.
Lastly, please please please! Take the time to explain your suggestions more clearly. 1 line of information is simply not enough. I'm not even sure bots driving vehicles is what you are asking for.