If a ferry has more than one deck, it should have at least one elevator that
is accessible to persons with disabilities, including persons who use a
wheelchair, that provides service from a vehicle deck to all the passenger
decks except for the uppermost, open observation deck. (Elevators as a
rule do not go to the uppermost, open observation deck. The elevator cab
must have a housing to enclose it completely to protect it and the
mechanical lifting device from the elements.)
Signs should be posted at each elevator explaining that there may be times
when the elevator may not be operational due to conditions where the
ship's roll exceeds the elevator manufacturer's safe operating criteria.
Travellers should be directed to alternative routes or to locations where
assistance is available.