As a regular walker here, I just head for the spiral staircase up to the Plimsoll Bridge and cross that way if both lock gates are open (though of course you still have to wait if there's a bridge swing, too.) However, the spiral staircases are narrow, tall and annoying if you have to carry a bike. Here the cyclist is chatting to the lock operator, presumably finding out how long he might have to wait.
GPS Coordinates:
51.44855, -2.62261
Location: Spike Island
