Staircase, elevator and other doors opening into gangways provide the opportunity for a crewmember walking past the door to be hit by it when opened from the other side. The image shows how the crew on one ship have reduced this risk by painting marks on the deck. The markings remind ships staff to take care when passing, as these doors may open suddenly. This can be accompanied by a notice on the other side of the door warning crew to open slowly! Click on the image to enlarge.