I don't see why not as long as it's legal for bicycles to be on that bridge. The only other issue would be is there a wide enough berm you can ride on so cars can pass you, if not that could be a consideration if it's a heavily traveled bridge, only because some dope doing 14 mph on a 55 mph bridge holding up traffic for 7 miles is a bit frustrating to motorists, and they could get quite angry, and road rage with a car vs a bicycle...well, I don't think I have to explain how that would turn out.