# Otoyol 7

The Otoyol 7 (O-7; English: Motorway 7), or Northen Marmara Motorway (Turkish: Kuzey Marmara Otoyolu), is a toll motorway in Turkey that bypasses Istanbul to the north. The motorway is 248 km in length between the Kınalı junction and the Akyazı junction, and is 8 lanes wide (4+4 lanes).Within the scope of the Build-Operate-Transfer Model Construction, Operation and Transfer of Kınalı-Odayeri (Including Connection Roads) Section (North Marmara Europan Motorway) and Kurtköy-Akyazı (Including Connection Roads) Section (North Marmara Anatolian Motorway) of the Northern Marmara Motorway (Including the 3rd Bosphorus Bridge) Project, it is composed of two separate authorized companies, namely "AVRUPA OTOYOLU YATIRIM VE İŞLETME AŞ". on the European side and "KMO ANADOLU OTOYOLU İŞLETME AŞ". on the Asian side.
The completed section of highway crosses the Bosphorus Strait via the Yavuz Sultan Selim Bridge, which was opened in August 2016. The route is intended to serve as the outermost beltway of Istanbul as well as being the third road crossing of the Bosphorus. The route stretches 250 km (160 mi) from Silivri, on the European side, to Akyazı on the Asian side. Connections to the O-4 as well as both the Bosphorus and Fatih Sultan Mehmet bridges will be built as the Northern Marmara Motorway and will bypass Istanbul to the north.
Up to 2016, the only section under construction was the 56 km (35 mi) section from Odayeri to Paşaköy. In this section, 14 tunnels, 61 viaducts, 45 underpasses, and 63 overpasses will be constructed.
The western (Silivri-Odayeri) and eastern (Kurtköy-Akyazı) sections were tendered in early May 2016. Construction was then estimated to take three years and to start in 2016. The section of motorway south of O-3 was constructed in 1987 and was listed as a connector of the O-3 until 2016. The T1 and T2 tunnels on this highway were the location for the world's longest flight through a tunnel

## Exit list
### Main route

| Province | District | km | mi | Exit | Destination | Notes |
| Istanbul | Silivri (Kınalı) | 0.00 | 0.00 | K10 | E80--Istanbul/Edirne (Kınalı junction) | E80 route |
| Istanbul | Silivri | 10.10 | 6.26 | K2 | North Marmara Europan Motorway "Silivri" junction | E80 route |
| Istanbul | Çatalca | 19.00 | 11.81 | | Çatalca Service Area | |
| Istanbul | Çatalca | 20.37 | 12.66 | | Çatalca KMO - T1 Tunnel | |
| Istanbul | Çatalca | 22.45 | 13.95 | | Çatalca KMO - T2 Tunnel | |
| Istanbul | Çatalca | 25.8 | 15.6 | K3 | North Marmara Europan Motorway "Çatalca" junction→ | |
| Istanbul | Çatalca (Nakkaş) | 32.4 | 21.40 | K4 | North Marmara Europan Motorway "Nakkaş" junction | E80 route |
| Istanbul | Arnavutköy | 37.50 | 23.30 | | Yassıören Service Area | |
| Istanbul | Arnavutköy | 41.60 | 25.85 | K5 | North Marmara Europan Motorway "Yassıören" junction | E80 route |
| Istanbul | Arnavutköy | 48.28 | 30 | K6 | North Marmara Europan Motorway "Tayakadın" junction | E80 route |
| Istanbul | Arnavutköy | 51.00 | 31.69 | | Tayakadın Service Area | |
| Istanbul | Arnavutköy | 54.13 | 33.64 | K7 | North Marmara Europan Motorway "Terminal2" Junction→Istanbul Airport | E80 route |
| Istanbul | Arnavutköy | 56.52 | 35.12 | K8 | North Marmara Europan Motorway "Terminal1" Junction→Istanbul Airport | E80 route |
| Istanbul | Arnavutköy | 58.21 | 36.17 | K9 | North Marmara Europan Motorway "Kargo" Junction→Istanbul Airport | E80 route |
| Istanbul | Eyüpsultan | 61.00 | 37.90 | K10 | North Marmara Europan Motorway "Odayeri" Junction→Northen Beltway | Connects to Northen Beltway,İstanbul Third Beltway |
| Istanbul | Eyüpsultan | 64.40 | 40.02 | | Odayeri Service Area | |
| Istanbul | Sarıyer | 77.00 | 47.85 | K11 | Northen Motorway "Uskumruköy" junction | E80 route |
| Istanbul | Sarıyer–Beykoz | 85.00 | 52.82 | | Yavuz Sultan Selim Bridge | E80 route |
| Istanbul | Beykoz | 93.00 | 57.79 | K12 | Northen Motorway "Riva" junction | E80 route |
| Istanbul | Beykoz | 101.00 | 62.76 | | Riva Tunnel | |
| Istanbul | Çekmeköy | 105.00 | 65.25 | K13 | Northen Motorway "Hüseyinli" Junction | E80 route |
| Istanbul | Çekmeköy | 107.00 | 66.49 | | Reşadiye Service Area | |
| Istanbul | Çekmeköy | 113.00 | 70.22 | K14 | Northen Motorway "Reşadiye" junction O-2/O-7 Connector | E80 route |
| Istanbul | Sancaktepe | 115.5 | 71 | K15 | Northen Motorway "Alemdağ" Junction→-Pendik,Şile | E80 route |
| Istanbul | Sancaktepe | 117.9 | 71.46 | K16 | Northen Motorway "Paşaköy" junction | E80 route |
| Istanbul | Pendik | 124.8 | 77.67 | K17 | Northen Motorway "Mecidiye" junction O-4/O-7 Connector | Connects to Sabiha Gökçen Airport |
| Istanbul | Tuzla | 135.2 | 85.29 | K18 | North Marmara Anatolian Motorway "Istanbul Park" junction | E80 route |
| Istanbul | Tuzla | 137.6 | 86.48 | | Istanbul Park Service Area | |
| Kocaeli | Gebze | 140.2 | 88.40 | K19 | North Marmara Anatolian Motorway "Gebze OSB" junction | |
| Kocaeli | Gebze | 146.70 | 91.16 | | Mollafenari Service Area |
| Kocaeli | Gebze | 148.50 | 93.52 | K20 | North Marmara Anatolian Motorway "Liman" junction connects to and | connects E80 to E881 |
| Kocaeli | Körfez | 163.65 | 101.69 | | Sevindikli Service Area |
| Kocaeli | Körfez | 166.2 | 105.25 | K21 | North Marmara Anatolian Motorway "Sevindikli" junction | |
| Kocaeli | Derince | 178.15 | 110.70 | | Kocaeli KMO - T1 Tunnel | |
| Kocaeli | Derince | 183.20 | 113.84 | | Kocaeli KMO - T2 Tunnel | |
| Kocaeli | İzmit | 185.50 | 115.27 | | Kocaeli KMO - T3 Tunnel | |
| Kocaeli | İzmit | 185.90 | 115.52 | | Kocaeli KMO - T4 Tunnel | |
| Kocaeli | İzmit | 189.06 | 115.48 | | Kocaeli KMO - T5 Tunnel | |
| Kocaeli | İzmit | 190.70 | 121.05 | K24 | North Marmara Anatolian Motorway "İzmit" junction →İzmit | |
| Kocaeli | İzmit | 198.00 | 123.03 | | İzmit Service Area | |
| Kocaeli | İzmit | 193.0 | 132.25 | K25 | North Marmara Anatolian Motorway "TEM İzmit" junction connect to | |
| Kocaeli | İzmit | 218.00 | 135.46 | | Akmeşe Service Area | |
| Kocaeli | İzmit | 210.8 | 139.07 | K26 | North Marmara Anatolian Motorway "Akmeşe" junction | |
| Sakarya | Adapazarı | 221.4 | 144.06 | K27 | North Marmara Anatolian Motorway "Adapazarı" junction→ | |
| Sakarya | Adapazarı | 229.4 | 144.06 | K28 | North Marmara Anatolian Motorway "Karasu" junction→ | |
| Sakarya | Akyazı | 240.9 | 144.06 | K29 | North Marmara Anatolian Motorway "D100 Akyazı" junction→ | |
| Sakarya | Akyazı | 248.7 | 145.62 | K30 | North Marmara Anatolian Motorway "TEM Akyazı" junction connect to -Ankara, Istanbul | E80 route |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Tolled |||||||

### Northen Beltway route

| Province | District | km | mi | Exit | Destinations | Notes |
| Istanbul | Bağcılar | 0.0 | 0.0 | K19 | O-3 "Mahmutbey Batı" junction | west beginning of Northern Beltway |
| Istanbul | Başakşehir | 0.2 | 0.12 | K36 | Northern Beltway "İstoç TEM" junction | Northen Beltway or İstanbul Third Beltway |
| Istanbul | Başakşehir | 0.8 | 0.50 | K35 | Northern Beltway "İstoç OSB" junction | |
| Istanbul | Başakşehir | 2.0 | 1.2 | K34 | Northern Beltway "İkitelli OSB" junction | |
| Istanbul | Başakşehir | 4.4 | 2.7 | K33 | Northern Beltway "Başakşehir Merkez" junction | |
| Istanbul | Başakşehir | 5.8 | 3.6 | K32 | Northern Beltway "Başakşehir" junction | European side 3rd Beltway and 2nd Beltway connection road |
| Istanbul | Arnavutköy | 8.5 | 5.3 | K31 | Northern Beltway "Fenertepe" junction | |
| Istanbul | Eyüpsultan | 17.6 | 10.9 | K30 | Northern Beltway "Işıklar" junction | |
| Istanbul | Eyüpsultan | 20.4 | 12.7 | K10 | Northern Beltway "Odayeri" junction | E80 O-7 route |
| Istanbul | Sarıyer | 36.0 | 22.4 | K11 | Northern Beltway "Uskumruköy" junction | E80 O-7 route |
| Istanbul | Bosphorus | 43.8 | 27.2 | Yavuz Sultan Selim Bridge | Yavuz Sultan Selim Bridge | Yavuz Sultan Selim Bridge |
| Istanbul | Beykoz | 51.9 | 32.2 | K12 | Northern Beltway "Riva" junction | E80 O-7 route |
| Istanbul | Çekmeköy | 64.5 | 40.1 | K13 | Northern Beltway "Hüseyinli" junction | E80 O-7 route |
| Istanbul | Çekmeköy | 71.9 | 44.7 | K14 | Northern Beltway "Reşadiye" junction | Anatolian side 3rd Beltway and 2nd Beltway connection road |
| Istanbul | Sancaktepe | 74.4 | 46.2 | K15 | Northern Beltway "Alemdağ" junction | E80 O-7 route |
| Istanbul | Sancaktepe | 76.8 | 47.7 | K16 | Northern Beltway "Paşaköy" junction | E80 O-7 route |
| Istanbul | Pendik | 83.7 | 52.0 | K17 | Northern Beltway "Mecidiye" junction | E80 O-7 route |
| Istanbul | Sultanbeyli | 86.5 | 53.7 | K3-1 | O-4 "Mecidiye 1" junction | east end of Northen Beltway |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Tolled |||||||

## Notable accidents

* 28 December 2023 — At least 10 people were killed and 61 others injured in a multiple-vehicle collision in Sakarya Province, Turkey.