If you plan to put your whole family in the car and head out for a car vacation, you definitely want the best driving safety. You definitely need to check that your car tires are in good conditions and that the tread depth is well above 5/32 inches. If you are close or are driving very far, you are probably better of changing them prior to the trip. If you get tires that have low rolling resistance you might even save a lot on fuel during the trip.