The laboratory has developed a mobile, easily installed transition structure that acts as a traffic way capable of supporting the heaviest military vehicles across unstable terrains. The basic unit of the traffic way is the Rush Roll, a 6-foot-diameter segmented cylinder of corrugated steel pontoons weighing 6000 pounds which can be towed by jeep. It can be delivered by LST to the seaward end of a pontoon causeway, or launched into the sea and towed to the beach by light amphibious craft. The Roll unfolds to form a four-trussed structure 13-1/2 feet wide and 17-1/2 feet long that can be rapidly joined with other units to create a roadway or floating pontoon bridge of any length, or may be assembled into rafts powered by outboard motors.
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