European route E66 is a part of the International E-road network. This Class A intermediate west-east route runs 651 kilometres (405 mi) from Franzensfeste in Italy to Székesfehérvár in Hungary, connecting the Alps with the Pannonian Plain.

Quick Facts E66, Route information ...

E66
Route information
Length	651 km (405 mi)
Major junctions
West end	Franzensfeste, Italy
East end	Székesfehérvár, Hungary
Location
Countries	Italy  Austria  Hungary
Highway system
International E-road network A Class B Class

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The E 66 routes through three European countries:

•  Italy
  • SS 49: Franzensfeste (with connection to European route E45) - Innichen - Winnebach
•  Austria
  • B 100 (Drautal Straße): Arnbach - Silian - Lienz - Oberdrauburg - Spittal an der Drau
  • A 10 (Tauern Autobahn): Spittal an der Drau - Villach
  • A 2 (Süd Autobahn): Villach - Klagenfurt - Graz - Riegersdorf
  • S 7 (Fürstenfelder Schnellstraße): A2 (Riegersdorf) - Dobersdorf
  • B 65 (Gleisdorfer Straße): Dobersdorf - Heiligenkreuz im Lafnitztal
•  Hungary
  • 8: Rábafüzes/Szentgotthárd - Körmend - Veszprém - Székesfehérvár.

Hungary requested in October 2011 that E66 should be extended from Székesfehérvár via Dunaújváros - Kecskemét to Szolnok. ^[1] This has not taken effect, so in 2019 Hungary requested the same extension Székesfehérvár – Szolnok again.^[2]