Otoyol 5


Otoyol 5, named the Kocaeli Gebze-Bursa-İzmir Motorway and abbreviated as O-5, is a toll motorway in Turkey. Since being completed in 2019, it connects the Istanbul and Kocaeli metropolitan areas with İzmir, via Bursa and Balıkesir. The O-5 runs parallel to the D575 and the D565 (Turkey)|D565] for most of its length and is a major motorway in Turkey as it provides a direct connection between Kocaeli and its surrounding metropolis to the country's 3rd largest and 4th largest cities, bypassing the Gulf of İzmit via the Osman Gazi Bridge. The O-5 also makes up part of the International E-road network E881 thus making it one of the most extensive and expensive transport megaprojects.
The western part of the Bursa Beltway, which is part of the O-5, was completed during the 2000s. 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. As of April 2017, the O-5 is open in two separate sections: the section from its northern terminus in Kocaeli, Gebze to Bursa, across the Osman Gazi Bridge along with a section from Kemalpaşa to its southern terminus in İzmir. The final section, Karacabey to Akhisar, opened on August 5, 2019.
The O-5 is the most expensive toll motorway in Turkey as the price for a personal vehicle from Kocaeli Gebze to Izmir, 984, including the Osman Gazi Bridge toll of 399.00.

Kocaeli Gebze-Bursa-İzmir Motorway Project details

The project includes the Osman Gazi Bridge, the Kocaeli, Gebze-Bursa section and the Bursa-İzmir section of Otoyol 5. It is a build-operate-transfer project which was awarded to a consortium consisting of 5 companies.

Key dates

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Guaranteed traffic volumes

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  • Gebze-Orhangazi : 40000 PCU/day
  • Orhangazi-Bursa: 35000 PCU/day
  • Bursa-Balıkesir: 17000 PCU/day
  • Balıkesir-İzmir: 23000 PCU/day

Technical details

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  • 377 kilometres of motorway, 44 kilometres of connection roads
  • 1 suspension bridge with a main span of 1,550 metres Osman Gazi Bridge
  • 30 viaducts
  • 3 tunnels
  • 209 small bridges
  • 18 toll plazas
  • 7 service areas and 7 parking areas

Tunnels