You must wear both your lap and shoulder belt if the vehicle is equipped with both even if the vehicle is equipped with air bags. The safety belt must be in good working order. If not, you may be given a traffic ticket for not wearing a safety belt. Also, you will be given the ticket if your passenger is younger than 16. A seat belt is required for each person who is age four or older and weighs over 40 lbs.
Safety belts can reduce injuries and deaths.
Many studies and actual crash tests have proven this. Crash tests have also reinforced the proper way for pregnant women to wear lap and shoulder belts. Wear the lap belt as low as possible under the abdomen and the shoulder strap between the breasts and to the side of the abdomen's bulge. If you wear only a lap belt when driving, your chances of living through an accident are twice as good as those of someone who isn't. If you wear a lap and shoulder belt, your chances are three to four times better.