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Chassis refers to a structural frame in which all OEM components are installed. Modern car bodies must be designed to protect the driver and passengers in a crash to provide adequate passenger and luggage space. But the need for fuel economy dictates that cars be lighter and smaller than models of conventional vehicles. The separate chassis frame once gave a car its structural strength, which provides a platform for mounting its mechanical components. The body was bolted to this frame, which made for a high and heavy but quiet and durable automobile. Recently, cars now have unit-body construction. Stamped sheet-steel parts are welded together to form box structures that work much like the trusses in a bridge to form a light but strong unit.