... permanent bailey bridges, whatever single lane or double/two lane type. We are capable to manufacture it, ... of steel bridges.1 Double lane,two vehicles passing on it 2 Easy installed 3 Send engineers to ... TS shows three ranges one tier; DD shows two range two tiers etc. 2.If R follows SS, DS, DD, ... etc, means reinforce type,and R1 means only one range reinforced, R2 means two ...