Izmit Bay Ring Metro Planned to Pass Through the Bay Bridge: It will be possible to create the backbone of the metro network of Kocaeli Province by establishing a 105 km metro or suburban line around the Izmit Bay by using the Bay Bridge. "Izmit Bay Ring Metro", which is expected to solve the transportation of Kocaeli province to a great extent, can be built in two stages.
1.ETAP RİNG METROSU: The ring metro, which runs around the eastern perimeter of the Izmit Bay, crosses the 1750 Km ring with a sea structure of 37 m. With this metro line which will appeal to İzmit City, many public transportation vehicles will be prevented from blocking roads.
2.ETAP RING METHOD: 1.Etap Ring Metro is the ring subway route that will be formed by passing the 65-70 Km to the west from both sides of the bay and passing over the Bay Bridge after reaching Gebze.
Source : http://www.vecdidiker.org