According to Forbes Autos, the average weight of "light-duty" vehicles rose from 3,221 pounds in 1997 to 4,144 pounds in 2007. Ironically, part of that weight gain comes from safety equipment that has been added over the past 10 years, some of which was federally mandated. But in balancing weight, fuel economy and safety, certain technology is crucial, the article contends.
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