Regulations 17-1.1.1 and 17-1.1.3 apply only to direct accesses from a ro-ro
space to spaces located below the bulkhead deck. The operation of watertight doors in
bulkheads separating a ro-ro space and other spaces as per regulation 13.8.1 should be
limited to compliance with regulation 23.3.

Regulation 17-1.1.2
If a non-watertight vehicle ramp closure is assumed to restrict the flow of
water during the calculation of the attained subdivision index A, the vehicle
ramp opening should comply with regulation 7-2.5.3.4.