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|---|---|---|---|---|
| Anadolu Otoyolu | ||||
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| Route information | ||||
Part of E80 E89 | ||||
Part of AH1 | ||||
| Length | 372 km (231 mi) | |||
| Existed | 1984–present | |||
| Major junctions | ||||
| West end |  O-1, inIstanbul | |||
| Major intersections | ||||
| East end |  O-20 inAnkara | |||
| Location | ||||
| Country | Turkey | |||
| Regions | Marmara,Black Sea,Central Anatolia | |||
| Provinces | Istanbul,Kocaeli,Sakarya,Düzce,Bolu,Ankara | |||
| Major cities | Istanbul,Izmit,Bolu,Ankara | |||
| Highway system | ||||
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O-4Otoyol 4 (English:Motorway 4), namedAnatolian Motorway (Turkish:Anadolu Otoyolu) and abbreviated asO-4, is atollmotorway connecting the northwesternMarmara Region to theCentral Anatolia Region in Turkey. It runs parallel to theD.100 for more than half of its length and then parallels theD750 for most of the eastern half. The O-4 is a major expressway in Turkey as it connects easternIstanbul and the heavily urbanized northeastern shore of theSea of Marmara to the nation's capital,Ankara. The O-4 also makes up part of theInternational E-road networkE80 andE89 as well as theAH-1 of theAsian Highway Network.
The O-4 is the longest completed motorway in Turkey spanning 379 km (235 mi), just 14 km (8.7 mi) longer than theO-52. The partially-openedO-5 is expected to surpass the length of the O-4, when it is completed in 2019, with a total length of 407 km (253 mi). but nowadays the longest motorway in Turkey isOtoyol 21 with the openingAnkara-Niğde section. Construction of the O-4 began in 1984 and was widely completed in 1992 except for a short gap through the mountains west ofBolu. This gap was connected in 2006, with the opening of theMount Bolu Tunnel.
The O-4 begins at the intersection with theO-1. The next interchange is in northern Ataşehir with theO-2 .[1] After the motorway crosses Necip Fazıl Boulevard, the last toll-free exit in Istanbul (K1), the O-4 becomes a toll-motorway at the Çamlıca toll booths. The first tolled exit is exit K2, which is theSamandıra-Kartal connector, that is the first of several connections to theD.100.[2] Exit K3 connects to Fatih Boulevard in Sultanbeyi.[3] The interchange with theO-7 is located just as the O-4 enters the district ofPendik. Exit K4 is located right on the eastern border of the Pendik district and connects to theSabiha Gökçen Airport.[4] After exit K4, the O-4 enters the last district in Istanbul,Tuzla. Exit K5 (Orhanlı junction) also offers a connection to the Sabiha Gökçen airport as well as theKurtköy-Pendik connector.[5] The O-4 continues through northern Tuzla, passing through mostly industrial parks until leaving theIstanbul Province and entering theKocaeli Province.
After crossing into Kocaeli, exit K6 is theŞekerpınar-Çayırova connector in Şekerpınar.[6] The O-4 traverses through northernGebze until exit K7, which is a direct connection to the D-100.[7] After crossing over the D-100, the O-4 interchanges with the northern end of theO-5 at the unnumbered Mualimköy junction.[8] Following the junction, the motorway runs along the heavily industrialized northern shore of theIzmit Bay with exits at Diliskelisi (K8)[9] and Hereke (K9, K10).[10][11] Between Hereke and Körfez the motorway runs directly next to the D-100 and theIstanbul-Ankara railway along the shoreline until the motorway entersKörfez. Once in the city, Exit K11 connects to the D.100.[12] Shortly after K11, an unmarked exit to a KGM employee housing facility.[13] The exit is not open to public traffic although cars may use the overpass to make a U-turn. After passing a service area, the O-4 enters the city ofİzmit. Exit K12 connects to the D.100 but only for traffic from/to Istanbul. The route then heads north and travels around the hilly northern perimeter of the city, passing through two tunnels and a viaduct. The O-4 crosses over theD.605, which can be accessed via Exit K12.[14] After bypassing Izmit, the motorway heads southeast, crossing over the D.100 (Exit K13[15]) in Bahçelievler. After the exit, the route entersSakarya Province.
Otoyol 4 parallels the Istanbul-Ankara railway along the southern shore ofLake Sapanca except for its short bypass around the town ofSapanca. Exit K14 connects to the town, via İzmit Avenue.[16]
| Province | District | km | mi | Exit | Destination | Notes |
|---|---|---|---|---|---|---|
| Istanbul | Ümraniye/Ataşehir | 0 | 0 | K10 |  P.34-12O-1 Çamlıca K13 junction connector O-2 Anadolu otoyolu K10 junction | O-1—O-2 connector road |
| 3.3 | 2.1 | K1 | İmes junction | O-4 route | ||
Samandıra Toll Plaza | ||||||
| Sancaktepe | 7.9 | 4.9 | K2 | Samandıra K2 junction connector P.34-27 | O-4 Connector to D.100 | |
| Sultanbeyli | 12.6 | 7.8 | K3 | Sultanbeyli K3 junction—Fatih Blvd,Sultanbeyli | ||
| 17.7 | 11 | K3-1 | Mecidiye K3-1 Junction connector to O-7 Mecidiye K17 junction | O-4 Connector toO-7 | ||
| pendik | 20 | 12.4 | K4 | Kurtköy K4 junction connector to P.34-28Pendik | Connector toD.100 and D.020 | |
| Tuzla | 21.6 | 13.4 | K5 | Orhanlı K5 junction connector toS. Gökçen Airport | ||
| Kocaeli | Çayırova | 29.6 | 18.4 | K6 | Şekerpınar K6 junction connector toÇayırova | Connector toD.100 |
| 31.4 | 19.5 | K6-1 | Muhsin Yazıcıoğlu Ave. — Gebze OSB | |||
| Gebze | 39.8 | 24.7 | K7 | D.100 —Gebze | ||
| 42.2 | 26.2 | K7-1 | MuallimKöy Junction connector toOsman Gazi Bridge,Yalova, thenİzmir |  O-5 | ||
| Dilovası | 46 | 28.6 | K8 | Liman Ave. —Dilovası | ||
| Körfez | 52.1 | 32.3 | K9 | D.100 —Hereke | Eastbound exit, westbound entrance | |
| 54.5 | 33.7 | K10 | D.100 —Hereke | Eastbound entrance, westbound exit | ||
| 67.9 | 42.2 | K11 | D.100 —Körfez | |||
| Derince | 75.1 | 46.7 | K12 | D.100 —İzmit | Eastbound exit, westbound entrance | |
| İzmit | Korutepe Tunnel | |||||
| Gültepe Tunnel | ||||||
| 86.8 | 53.9 | K13 |  D.605 —İzmit,Kandıra | |||
| Kartepe | 94.2 | 58.5 | K14 | D.100 —İzmit | ||
| Sakarya | Sapanca | 101.5 | 63.1 | K15 | P.54-52 —Sapanca | |
| Arifiye | 114.1 | 70.9 | K16 |  D.650 —Arifiye,Sakarya | ||
| Akyazı | 130.8 | 81.3 | K17 |  D.140 —Akyazı | ||
| Hendek | 137.4 | 85.4 | K18 | Hendek connector —Hendek | Connector toD.100 | |
| Düzce | Düzce Merkez | 169 | 105 | K19 | D.100 —Düzce | |
| 189.8 | 117.9 | K20 | D.100 —Kaynaşlı | |||
| Bolu | Bolu Merkez | Mount Bolu Tunnel | ||||
| 200.9 | 124.8 | K21 |  P.14-50 —Abant | |||
| 207.9 | 129.2 | K22 | D.100 —Bolu | Bolu west | ||
| 227.1 | 141.1 | K23 | D.100 —Bolu | Bolu east | ||
| Yeniçağa | 249.6 | 155.1 | K24 | D.100 —Yeniçağa | ||
| Gerede | 259.5 | 161.2 | K25 |  P.14-05 —Dörtdivan | ||
| 266.2 | 165.4 | K26 | Gerede connector —Gerede /D.100 —Karabük | |||
| Ankara | Çamlıdere | 311.1 | 193.3 | K27 |  P.06-86 —Çamlıdere | |
| Kızılcahamam | 326.9 | 203.1 | K28 |  P.06-82 —Kızılcahamam,Güdül | ||
| Kazan | Kazan Toll Plaza | |||||
| 358.7 | 223.5 | K29 | Fevzi Çakmak Ave. —Kahramankazan | |||
| 362.7 | 224.2 | K30 |  P.06-75 —Mürted Air Base | |||
| Yenimahalle | 371.7 | 231 | K1 | O-20 —Ankara | Ankara Beltway | |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi | ||||||
| Current |  | |
|---|---|---|
| Former | ||
| Planned | ||
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