Sport utility vehicle (SUV) sales are increasing despite the safety restrictions. SUV standards require the vehicle to be built for occasional off-road use. The high center of gravity feature aids off-road driving but also increases the amount of fatal accidents. It is estimated that over 90 percent of all SUVs purchased are rarely used off road. As an increased number of consumers purchase them for use in metropolitan areas, the numbers of SUVs driven off road continues to decline.