Public roads in Romania are ranked according to importance and traffic as follows: motorways – colour: green; designation: A followed by one or two digits expressways – colour: red; designation: DX followed by one or two digits and an optional letter national road – colour: red; designation: DN followed by one or two digits and an optional letter county road – colour: blue; designation: DJ followed by three digits and an optional letter; unique numbers per county local road – colour: yellow; designated DC followed by a number and an optional letter; unique numbers per countySome of the national roads are part of the European route scheme. Wikipedia