Spaces not normally subdivided in any way and extending to either a substantial length or the entire length of the ship in which goods can be loaded and unloaded normally in a horizontal direction.
- Open ro-ro cargo spaces – Spaces either open at both ends, or open at one end and provided with adequate natural ventilation effective over their entire length through permanent openings in the side plating or deckhead to the satisfaction of the Administration, (SOLAS).
- Closed ro-ro cargo spaces – Spaces which are neither open ro-ro cargo spaces nor weather decks, (SOLAS).