Otoyol 5
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| Otoyol 5 | |
| Gebze-Orhangazi-İzmir Otoyolu | |
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| Route information | |
Part of 
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| Length: | 407 km (253 mi) |
| Major junctions | |
| From: |
 at Gebze
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| To: |
 at İzmir
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| Location | |
| Regions: | Marmara, Aegean |
| Provinces: | Kocaeli Province, Yalova Province, Bursa Province, Balıkesir Province, Manisa Province, İzmir Province |
| Major cities: | Gebze, Altinova, Yalova, Orhangazi, Gemlik, Bursa, Karacabey, Susurluk, Balıkesir, Savaştepe, Soma, Kırkağaç, Akhisar, Saruhanlı, Turgutlu, İzmir |
| Highway system | |
Otoyol 5 (English: Motorway 5), also known as Gebze-Orhangazi-İzmir Otoyolu (English: Gebze-Orhangazi-İzmir Motorway) and abbreviated as O-5, is a partially completed toll motorway connecting Istanbul and İzmir in the Marmara and Aegean Regions in Turkey. It runs parallel to the D575 and the D565 for most of its length. The O-5 will be a major motorway in Turkey as it will provide a direct connection between Istanbul and its surrounding metropolis to the country's 3rd largest (İzmir) and 4th largest (Bursa) cities, bypassing the Izmit Bay via the İzmit Bay Bridge. The O-5 will also make up part of the International E-road network E881.
The western part of the Bursa Beltway (formerly known as Otoyol 33), which is part of the O-5, was completed during the 2000's. The rest of the O-5 has been under construction since the early 2010s, with the first portion opened from Altinova to Gemlik in April 2016. The section containing the Osman Gazi Bridge (Gebze-Altınova) opened in July 2016.
The project includes the İzmit Bay Bridge, the Gebze-Bursa section and the Bursa-İzmir section of Otoyol 5. It is a build-operate-transfer project which was awarded to a consorstium consisting of 5 companies (Nurol, Özaltın, Makyol, Göçay and Astaldi).
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