Otoyol 5



Otoyol 5 (Motorway 5), named the Gebze-Orhangazi-İzmir Motorway (Gebze-Orhangazi-İzmir Otoyolu) and abbreviated as O-5, is a toll motorway in Turkey. Since being completed in 2019, it connects the Istanbul metropolitan area with İzmir, via Bursa and Balıkesir. 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 Istanbul and its surrounding metropolis to the country's 3rd largest (İzmir) and 4th largest (Bursa) 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.

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 105.5 km section from its northern terminus in Gebze to Bursa, across the Osman Gazi Bridge along with a 18.2 km 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 Gebze to Izmir 147 km, TRY 984 (US$ 29.76), including the Osman Gazi Bridge toll of TRY 399.00 (US$ 12.07).

Gebze-Orhangazi-İzmir Motorway Project details
The project includes the Osman Gazi 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 consortium consisting of 5 companies (Nurol, Özaltın, Makyol, Göçay and Astaldi).

Key dates

 * Tender: 9 April 2009
 * Signing of contract: 27 September 2010
 * Date of effect: 15 March 2013
 * End of contract: 15 July 2035
 * Construction time: 7 years

Guaranteed traffic volumes

 * Gebze-Orhangazi (including bridge): 40000 PCU/day
 * Orhangazi-Bursa: 35000 PCU/day
 * Bursa-Balıkesir: 17000 PCU/day
 * Balıkesir-İzmir: 23000 PCU/day

Technical details

 * 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 (18,212 metres)
 * 3 tunnels (6,200 metres)
 * 209 small bridges
 * 18 toll plazas
 * 7 service areas and 7 parking areas

Tunnels

 * Orhangazi Tunnel - 3,586 m (11,211 ft)
 * Selçukgazi Tunnel - 1,234 m (4,049 ft)
 * Belkahve Tunnel - ~1,700 m