21.—(1) This Part applies to—
(a)United Kingdom ro-ro passenger ships; and
(b)non-United Kingdom ro-ro passenger ships with the exception of—
(i)regulation 24(2) and (3);
(ii)regulation 26(2) to the extent that it relates to regulation 24(2);
(iii)regulation 27(1) and (2) to the extent that it relates to any berth which is not situated within a port in the United Kingdom; and
(iv)regulation 28(2).
(2) In this Part the following expressions have the following meanings—
“doors” includes bow visors and appliances described in regulation 22(1)(c);
“length” means the ship’s overall length; and
“loading doors” means the doors described in regulation 22(1)(a) to (d) inclusive.
(3) A door shall be deemed to be above the bulkhead deck if the sill of the opening with which it is associated is above that deck.