An armoured vehicle-launched bridge (or AVLB) is a combat support vehicle, sometimes regarded as a subtype of combat engineering vehicle, designed to assist militaries in rapidly deploying tanks and other armoured fighting vehicles across rivers. The AVLB, usually built from a converted tank chassis (and hence a tracked vehicle), carries a folding metal bridge atop its chassis, often in 3 sections. The AVLB's job is to accompany armoured or infantry divisions to water crossings. When a river too deep for non-deep-wading vehicles is reached, and no bridge is conveniently located (or sufficiently sturdy, a not-insubstantial concern when moving 60-ton tanks), the bridge-layer unfolds and launches its bridge, a process that takes only minutes. Once the span has been emplaced, the AVLB decouples from its bridge, and moves aside to allow traffic to pass. Once all of the vehicles have been moved, it reattaches to the bridge from the other side and retracts the span. A similar procedure can be employed to allow crossings of small chasms or similar obstructions. AVLBs can carry bridges of 60 feet (19 meters) or greater in length. By using a tank chassis, the bridge-layer is able to cover the same terrain as main battle tanks, and the provision of armour allows them to operate even in the face of enemy fire. However, this is not a universal attribute: some exceptionally sturdy 6x6 or 8x8 truck chassis have lent themselves to bridge-layer applications. http://en.wikipedia.org/wiki/Armoured_vehicle-launched_bridg...
An armoured vehicle-launched bridge (or AVLB) is a combat support vehicle, sometimes regarded as a subtype of combat engineering vehicle, designed to assist militaries in rapidly deploying tanks and other armoured fighting vehicles across rivers. The AVLB, usually built from a converted tank chassis (and hence a tracked vehicle), carries a folding metal bridge atop its chassis, often in 3 sections. The AVLB's job is to accompany armoured or infantry divisions to water crossings. When a river too deep for non-deep-wading vehicles is reached, and no bridge is conveniently located (or sufficiently sturdy, a not-insubstantial concern when moving 60-ton tanks), the bridge-layer unfolds and launches its bridge, a process that takes only minutes. Once the span has been emplaced, the AVLB decouples from its bridge, and moves aside to allow traffic to pass. Once all of the vehicles have been moved, it reattaches to the bridge from the other side and retracts the span. A similar procedure can be employed to allow crossings of small chasms or similar obstructions. AVLBs can carry bridges of 60 feet (19 meters) or greater in length. By using a tank chassis, the bridge-layer is able to cover the same terrain as main battle tanks, and the provision of armour allows them to operate even in the face of enemy fire. However, this is not a universal attribute: some exceptionally sturdy 6x6 or 8x8 truck chassis have lent themselves to bridge-layer applications. http://en.wikipedia.org/wiki/Armoured_vehicle-launched_bridg...
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