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O-31

Motorway in Turkey
Otoyol 31, named the İzmir-Aydın Motorway or just the Aydın Motorway and abbreviated as the O-31 is a 127.8 km long toll motorway in western Turkey. Beginning at an intersection with İzmir Beltway, the O-31 runs south from İzmir to Aydın and parallels the D550 for most of its route. Wikipedia