The development of integral transport, i.e. the establishment of palletization and containerization, leads to the simultaneous development of multimodal transport. This new shipping technology is characterized by RO-RO ships. Realization does not require large investments in mechanization or terminals. By transporting cargo on wheels, RO-RO ships form a continuation of land freight routes across the sea, enabling the transport of goods from producers to consumers. At the very beginning, RO-RO ships were designed for shorter routes, but later they justified themselves on longer routes as well. Combined RO-RO ships, in addition to cargo on wheels, partially transport containers in warehouses and on deck with the possibility of horizontal (RO-RO) and vertical (LO-LO) manipulation. The structure of RO-RO ships is characterized by the size and design of the ship's ramps, which imposes the high cost of building these ships. When operating a ship, ramps are rarely used, which necessitates the installation of smaller and cheaper ramps, and more and more funds are invested in Link spans at port terminals where the equipment is used more efficiently. According to the accidents that have occurred, in the future it will be necessary to stricter regulations in the construction of these ships. This mainly refers to the stability of the ship in a damaged state, to the system of partitioning with impermeable partitions and to the prevention of flooding. Also, the International Maritime Organization (IMO) adopted a series of amendments to the International Convention for the Safety of Life at Sea (SOLAS) for this purpose.