(), named the Kocaeli Gebze-Bursa-ðzmir 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 ðzmir, via Bursa and Balñkesir. The O-5 runs parallel to the D575 and the 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 (ðzmir) and 4th largest (Bursa) cities, bypassing the Gulf of ðzmit 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 Kemalpaà Âa to its southern terminus in ðzmir. 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 ( 29.76), including the Osman Gazi Bridge toll of 399.00 ( 12.07).
The project includes the Osman Gazi Bridge, the Kocaeli, Gebze-Bursa section and the Bursa-ðzmir section of Otoyol 5. It is a build-operate-transfer project which was awarded to a consortium consisting of 5 companies (Nurol, ÃÂzaltñn, Makyol, Göçay and Astaldi).
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