The Carreteras Nacionales de España or National Roads of Spain are roads of governmental property, managed by the Ministry of Development (Spain) and form the Red de Carreteras del Estado or State Roads Network.A road numbering scheme is used according to rules by the fourth General Road Plan (Plan General de Carreteras) of 1939-1941 (Plan Peña).Six radial roads which connect Madrid with its coasts and its borders divide the Spanish continental territory (except for the Canary Islands and Balearic Islands) into 6 radial sectors. These radial roads are enumerated in clockwise fashion as follows: