Water transport includes barges, boats, sailboats and ships through canals, rivers and seas. The earliest boats and ships were routed through inland canals for transporting people and spices. Today large passenger and cargo ships provide an organized and efficient transportation method. Although the time involved is long, water transportation is significantly less expensive than air or road. Other less used modes include cable and pipeline transports which are specifically purpose oriented – e.g. liquids and gases, water, sewage etc. for pipeline transport and conveyor belts, aerial tramways, cable cars etc. for cable transport.