| 摘要 |
A motor vehicle safety system for a motor vehicle having wheels and tires on the wheels includes a hydraulically extendable elongate arcuate member in an elongate arcuate housing extending around an upper portion of each tires, and a valve operable in response to an impact on the impact sensor to apply hydraulic pressure from an oil supply system to the arcuate housing to displace the arcuate member along the arcuate housing from a retracted position in the arcuate housing to an extended position in which the arcuate member projects from the housing with an end located beneath the tire. Alternatively, the arcuate member may be released for displacement by gravity into its extended position. Rollers projecting from the arcuate member are in rolling engagement with the tire and with the ground on displacement of the arcuate member into the extended position.
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