Abstract: A device mountable on top of a truck cab so to automatically warn a truck driver if the truck body can clear underneath a bridge or other overhead structure; the device consisting of an upwardly telescopic rod that is adjustable to the height of the truck body or box and which, upon contact with any overhead object, will flex and bend over so to act as a switch arm of a switch for closing an electric circuit to either a light on the dashboard or other signalling device to the driver.

Abstract: A footstep carried by a cab of a large automotive truck so that a driver of the vehicle can more easily step up or step down between the cab and ground; the footstep being vertically movable so to minimize a stepping distance; the device including a hydraulic or pneumatic powered cylinder having a slidable piston to which the footstep is rigidly secured.