In a number of locations where we installed our bridge-mount dry fire hydrants the local fire department carries a short length of suction hose on their pumper for use on those dry fire hydrants. Because the pumper is sitting on the bridge and because most bridges have limited shoulder areas, the shorter length of suction hose allows the pumper to stay in a single traffic lane and thus keep a lane of traffic open. Suction hose can be cut and coupled in a variety of lengths by most manufacturers; while we often talk about carrying longer lengths of suction hose...some times a shorter one works better.
Short length in use at a GBW bridge-mount dry fire hydrant.