A、In America cars have been equipped with safety belts since 1964. B、In America cars were equipped with safety belts until 1964.

The life-saving value of safety belts has been firmly established by many studies. Most serious injuries and deaths resulting from even minor accidents are caused by people being thrown out of or against the interior of the vehicle. One study showed that 40 percent of those killed in traffic accidents would have been saved if they had been wearing safety belts.
    Safety belts have been standard equipment on all automobiles sold in the U.S. since 1964. Since long before that, safety minded organizations have been advocating that motor vehicle drivers and passengers make it a habit to use safety belts whether they are driving across the country or across town. Millions of dollars worth or public service advertising has been donated by newspapers, magazines, radio and television to remind motorists and passengers to wear safety belts.