launch and dismantle a bridge. The modular design of the equipment means it can be constructed in a large number of different configurations, allowing the system to be used for a wide range of load and spans. The LSB can be deployed on main supply routes to provide new bridges, replace damaged bridges or to upgrade smaller bridges for heavier traffic like tanks and heavy equipment. The LSB overcomes limitations in width, span, capacity and fatigue that is associated with many other systems in the RE use The LSB can be built by hand, but where cranes and other mechanical handling equipment are available, they are used to reduces the time it takes to build and also the number of trained personal needed. Bridge components can be transported using DROPS (NATO) flat racks and ISO shipping containers. The bridge can be constructed by a Royal Engineer Section; when mechanical equipment is used, without it can take up to three sections. Once constructed a LSB tends to remain in situ for far longer periods than either a CSB or a GSB, one bridge in Iraq remained in use for three years. The bridge has a width (roadway) of 4.2m and can be built with sloping or level access ramps depending on the site. Logistic Support Bridge (LSB) Fixed Pier The pier consists of 2 towers that are constructed from standard bridging panels with the addition of some other key components. Both piers are built separately, the pier caps are then moved into position to form a platform on which rollers are secured to allow the bridge to be boomed across a river. For this it is important to have a crane. It is used when the river banks are too steep to allow the bridge to just be swung across. It has also been used when the bank of the river is not strong enough to support simpler constructions. BR 90 Bridging BR-90 GSB The BR-90 GSB is the primary general support bridge. It uses the same modular components as the Close Support Bridges. A standard bridge set is carried, launched and recovered from 3 specialist vehicles (1 x Automotive Bridge Launching Equipment (ABLE) and 2 x Bridging Vehicles (BV). Up to 44m of bridge can be built using this system, although only 32m is possible with the 3 vehicle combination. To construct a single bridge the following equipment is used: