The obvious design procedure
for RO - RO ferries requiring compliance with SOLAS 90, or with North European
Regional Agreement requiring SOLAS 90 Plus Water On Deck, is by a combination
of increased freeboard and increased breadth ...
Considerable excess
intact (undamaged) stability becomes unavoidable. Such excess of intact
stability makes for uncomfortable ships in bad weather. Short rolling periods
raise problems for adequate securing of vehicles - especially at upper deck
level.