You may find that you have become

1. You may find that you have become hyper-alert when in a car, to the extent that it actually makes driving more difficult.
2. Because driving is essentially an unconscious activity (you don't think about shifting gear, or pressing the brake), too much anxiety can interfere with the smooth operation of the car.
3. will help retrain your mind to relax when at the wheel while retaining a safe level of focus.

1. You are a much safer driver when you are relaxed than when you are stressed, as you probably know..