Roll-on/roll-off (RORO or ro-ro) ships are cargo ships designed to carry wheeled cargo, such as cars, motorcycles, trucks, semi-trailer trucks, buses, trailers, and railroad cars, that are driven on and off the ship on their own wheels or using a platform vehicle, such as a self-propelled modular transporter.
With RoRo, your car or RV is driven right onto the vessel, where it is firmly secured to the ship deck. The cars are held inside the ship, keeping them safe from the elements and the sea. As the term implies, container shipping involves storing your car or motorcycle in a container.