I agree totally with the obedience training, and I'll give you the same bad-behaviour advice I give everyone: "A tired dog is a good dog."

EXERCISE YOUR DOG...if you give him other things to chase, and make him good and tired every day, the driving force behind car-chasing is gone to lack of pent-up energy. You also get the benifit of bonding time with a member of your family, as well as getting some exercise for yourself. If you cannot manage a half-hour of your time to spend with your dog, you shouldn't have one.