RORO means roll on roll off and it's a specific type of service offered by the Shipping Lines for shipping vehicles only. These ships are like giant indoor floating parking lots that can hold from 400 cars up to 1,000 cars in one shot. Roro vessels have the capability to accommodate motorcycles, boats, trailers, RV'S, and heavy equipment. It should be pointed out that they don't carry containers and they certainly do not carry passengers.