Roll-on/roll-off 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. This is in contrast to lift-on/lift-off (LoLo) vessels, which use a crane to load and unload cargo.
Procyon Leader stern quarter ramp
Loading a ro-ro passenger car ferry
Train ferry and roll-on/roll-off between Calabria and Sicily
ROPAX ferry, MS Ulysses, approaching Dublin Port, Ireland
A cargo ship or freighter is a merchant ship that carries cargo, goods, and materials from one port to another. Thousands of cargo carriers ply the world's seas and oceans each year, handling the bulk of international trade. Cargo ships are usually specially designed for the task, often being equipped with cranes and other mechanisms to load and unload, and come in all sizes. Today, they are almost always built of welded steel, and with some exceptions generally have a life expectancy of 25 to 30 years before being scrapped.
Cargo ship at Puerto Cortés in Honduras.
A container ship unloading at Zanzibar, Tanzania
A US cargo ship off McMurdo Station, Antarctica
General cargo ship Namibia