|Length:||99 km (62 mi)|
|Major cities:||Adana, Tarsus, Mersin|
Otoyol 51 (English: Motorway 51), abbreviated as O-51, aka Adana-Erdemli Otoyolu (English: Adana-Erdemli Motorway), is a toll motorway in the Mediterranean Region of Turkey, connecting the cities Adana and Mersin. The motorway is on its full length of 99 km (62 mi) part of international routes as of European route E90 and Asian Highway 84.
The motorway starts from the western terminus of Adana-Şanlıurfa Motorway O-52, runs westward reaching the south terminus of Pozantı-Adana Motorway O-21 northeast of Tarsus, continues southwest to Mersin bypassing it at north and terminates in Erdemli.
There are plans to extend the motorway to Silifke.
|Adana||3.0||5.1||K3||Alparslan Türkeş Boulevard Exit|
|Adana||3.3||8.4||K4||Adana North Exit|
|Adana||7.5||15.9||K5||Adana West Exit|
|Adana West Toll Plaza|
|Mersin||19.1||35.0||K19||Tarsus East Interchange and Exit|
|Mersin||11.0||48.1||K7||Tarsus West Exit|
|Mersin East Toll Plaza|
|Mersin||24.0||72.1||K8||Free Area Exit|
|Mersin||7.4||84.3||K10||Mersin Stadium Exit|
|Mersin||7.3||99.2||K12||Çeşmeli Exit||End of Motorway|
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