Road, air, and water transport are the main types of goods transport operations. Road transport involves moving goods and personnel between destinations via motor vehicles or non-motor vehicles on roads. Air transport allows for fast international transport of people and goods between countries. Water transport is the process of moving people and goods via barge, boat, ship, or sailboat over seas, oceans, lakes, rivers, or canals. Depots are transport systems' operating bases that provide parking, maintenance, administrative functions, and staff facilities.