Public roads in Romania are ranked according to importance and traffic as follows: motorways (autostradă – pl. autostrăzi) – colour: green; designation: A followed by one or two digits expressways (drum – pl. drumuri expres) – colour: red; designation: DX followed by one or two digits and an optional letter national road (drum național – pl. drumuri naționale) – colour: red; designation: DN followed by one or two digits and an optional letter county road (drum județean – pl. drumuri județene) – colour: blue; designation: DJ followed by three digits and an optional letter; unique numbers per county local road (drum – pl. drumuri comunale) – colour: yellow; designated DC followed by a number and an optional letter; unique numbers per county Some of the national roads are part of the European route scheme. European routes passing through Romania: E58; E60; E70; E85; E79; E81; E68; E87 (Class A); E574; E576; E581; E583; E671; E771. As of 31 December 2021, public roads totaled : 17,530 km (20.3%) national roads, 35,096 km (40.7%) county roads and 33,573 km (39%) local roads. From the point of view of the type of cover, the structure of the public road network registers at the end of 2019 was: 38,166 km (44.2%) modernized roads (92.8% with asphalt pavements of heavy/medium type and 7.8% with concrete), 21,365 km (24.7%) with light asphalt road clothing, 17,831 km (20.6%) cobblestone roads and 9,021 km (10.5%) dirt roads. Of all cobblestone and dirt roads 73% are local roads. Regarding the technical condition, 13,411 km (35.1%) of modernized roads and 9,217 km (43.1%) of roads with light road clothing have exceeded their "service life". Motorways Development of the overall length (at the end of): Motorways are identified by A followed by a number. As of December 2022, Romania has 996 km of motorway in use, with another 199 km under construction. In recent years, a master plan for the national motorway network has been developed and many works have begun around the country, which will result in significant changes by 2015, and eventually by 2022. There are few tolls for using roads in Romania. There is one at the Giurgeni – Vadu Oii Bridge over the river Danube on highway DN2A at Vadu Oii and one at the Cernavodă Bridge, on the A2 motorway, a 17 km long section between Fetești and Cernavodă which consists of two road/railway bridges. Nevertheless,