Frame: Two parallel boxed rails held together by cross members are the main composites of the frame of a truck. They may also be called as ladder frames since they resemble that of a ladder when tipped on end. Crossmembers are mostly attached to frame rails by using rivets or bolts, but sometimes may be welded in case of heavy duty application. The material used to make frame is generally steel but aluminium can also be a substitute to it.
Although trucks contribute to some pollution, they eject fewer air polluting emissions when compared to a car or any other vehicle, but still it contributes to a high level of sound pollution.