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A lowbridge double-deck bus is a double-decker bus that has an asymmetric interior layout, enabling the overall height of the vehicle to be reduced compared to that of a conventional double-decker bus. The upper-deck gangway is offset to one side of the vehicle, normally the offside (or driver's side), and is sunken into the lower-deck passenger saloon. Low railway bridges and overpasses are the main reason that a reduced height is desired.