The majority of the goods in the RoRo traffic are transported by using specialized load
carriers – the so-called heavy low-floor trailers. RoRo stands for “Roll on Roll off” and describes a
ship and a type of sea transport. By this type the cargo is loaded and unloaded on their own axis
(trucks, swap trailers, construction vehicles, farming machines etc.) or on low-floor trailers (machine,
system parts etc.) over ship ramps. The advantage of RoRo transportation is the high speed of the
cargo transshipment and the low extra requirements to the port infrastructure. Low-floor trailers can
be seen as an equipment of the RoRo ships and they usually belong to the shipping companies. They
are especially appropriate for goods transport between ships at the seaport. Despite the high
specialization of their operation they also apply to the basic criteria of load carriers, which are used
in the multi modal transport chain. Load carriers are defined in DIN 30781 as a supporting
instrument to hold the cargo as one loading unit and fulfill the transport, hold and load functions as
well as security functions for the cargo (Arnold, 2004) (Pfohl, 2004).