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National Road 51
National Road 51
Εθνική Οδός 51
Route information
Length	128 km (80 mi)
Major junctions
North end	Kastanies
South end	Ardani
Location
Country	Greece
Regions	East Macedonia and Thrace
Major cities	Didymoteicho, Orestiada
Highway system
	Highways in Greece; Motorways; National Roads;

Greek National Road 51 (Greek: Εθνική Οδός 51, abbreviated as EO51) is a predominantly single carriageway road in the Evros regional unit of Greece. The road is a branch of the EO2 from Alexandroupolis and runs almost parallel to the Evros river from Ardani in the south to Kastanies in the north, before meeting the D.100 road at the Greece–Turkey border towards Edirne. The EO51 is about 128 km long, and forms part of the European route E85.^[1]

Route

The EO51 is officially defined as a branch of the EO2 from Ardani (about 40 km east of Alexandroupolis) to the Greece–Turkey border between Kastanies and Edirne (Adrianopolis), via Soufli, Didymoteicho and Orestiada.^[2] The EO51 generally runs parallel to the Evros river on the western bank, up towards Kastanies: the EO51 then turns east, south of the Arda river, to meet the D.100 road at the Greece–Turkey border, towards Edirne. There is an interchange with the A2 motorway (Egnatia Odos), 2 km north from the southern end of the EO51.

In the 2000s, a new single carriageway link road was built as a branch of the EO51 from Kastanies to Svilengrad in Bulgaria, avoiding Turkey and meeting the I-88 road at a new border crossing at Ormenio:^[3] the Hellenic Statistical Authority designates the Kastanies–Ormenio link road as the EO52 road, but that number is not used in practice.^[4] The new road was part of a project to complete the European route E85, which on 12 September 1986 was rerouted from the then-planned road between Podkova and Komotini (now part of the A23 expressway in Greece)^[5] to cover almost the entirety of the EO51 towards Alexandroupolis, except for the connection between Kastanies and the D.100 road.^[6] Greece adopted the current E-road numbering system on 9 January 1989, when it joined the 1975 European Agreement on Main International Traffic Arteries (AGR).^[7]

History

Ministerial Decision G25871 of 9 July 1963 created the EO51 from part of the short-lived EO41 from 1955, which followed the route of the current EO2 from Thessaloniki to Ardani, and then the current EO51 for the remainder.^[8]^[2]

References

^ "European Agreement on Main International Traffic Arteries" (PDF). United Nations Economic Commission for Europe. Geneva: United Nations. 1 November 2016. p. 12. ECE/TRANS/SC.1/2016/3/Rev.1. Archived (PDF) from the original on 6 April 2023. Retrieved 15 August 2024.
^ ^a ^b Ministerial Decision G25871/1963 (FEK B' 319/23.07.1963, pp. 2500–2501).
^ "СПИСЪК на републиканските пътища в Република България" [List of republican roads in the Republic of Bulgaria] (PDF). National Assembly of the Republic of Bulgaria (in Bulgarian). Sofia. 7 January 2019. p. 4. Archived from the original (PDF) on 28 August 2024. Retrieved 28 August 2024.
^ "Μητρώο Εθνικών Οδών" [Register of National Roads] (PDF) (in Greek). Athens: Hellenic Statistical Authority. 1998. pp. 13–20. Archived from the original (PDF) on 8 June 2019. Retrieved 30 August 2024.
^ "Maintenance contractors". Egnatia Odos. Thermi. 16 March 2020. Archived from the original on 28 August 2024. Retrieved 28 August 2024.
^ "Entry into force of amendments to annex I" (PDF). United Nations Treaty Series (in English and French). 1436. New York City: United Nations: 325–334. 12 September 1986. Archived from the original (PDF) on 31 March 2016. Retrieved 6 September 2024.
^ "Accession by Greece" (PDF). United Nations Treaty Series (in English and French). 1515. New York City: United Nations: 345. 11 October 1988. Archived from the original (PDF) on 31 March 2016. Retrieved 6 September 2024.
^ Royal Decree of 9 August 1955 (FEK A' 222/20.08.1955, pp. 1824–1825).