In Israel, private automobiles, bus service, and an expanding railway network are the primary modes of transportation. Due to Israel's small size and lack of inland waterways, air and water transportation are only marginally relevant for domestic travel, but they are crucial for international connections. All sectors are driven by the demands of population growth, politics, the Israel Defense Forces, tourism, and increased traffic. This is a major factor in the movement away from motorized road transportation and toward rail and public transportation. The Ministry of Transport and Road Safety is in charge of all aspects of Israeli transportation.