Transport in Croatia relies on several main modes, including transport by car, train, boat and plane. Road transport incorporates a comprehensive network of state, county and local routes augmented by a network of highways for long-distance travelling. Water transport can be divided into sea, based on the ports of Rijeka, Ploče, Split and Zadar, and river transport, based on Sava, Danube and, to a lesser extent, Drava. Croatia has 68 airports, nine of which are international. The country also has several airlines, of which the most notable are Croatia Airlines and Trade Air. Rail transport is fairly developed, with dual track and electrification not very common, although high-speed tilting trains are used on some routes. However, bus still tends to be more common than rail as a mode of int