Otoyol 4 ( en, Motorway 4), named Anatolian Motorway ( tr, Anadolu Otoyolu) and abbreviated as O-4, is a toll

motorway A controlled-access highway is a type of highway that has been designed for high-speed vehicular traffic, with all traffic flow—ingress and egress—regulated. Common English terms are freeway, motorway and expressway. Other similar terms ...

connecting the northwestern

Marmara Region The Marmara Region ( Turkish: ''Marmara Bölgesi'') is a geographical region of Turkey. Located in northwestern Turkey, it is bordered by Greece and the Aegean Sea to the west, Bulgaria and the Black Sea to the north, the Black Sea Region to t ...

to the

Central Anatolia Region The Central Anatolia Region ( tr, İç Anadolu Bölgesi) is a geographical region of Turkey. The largest city in the region is Ankara. Other big cities are Konya, Kayseri, Eskişehir, Sivas, and Aksaray. Located in Central Turkey, it is bordered ...

in Turkey. It runs parallel to the D.100 for more than half of its length and then parallels the D750 for most of the eastern half. The O-4 is a major expressway in Turkey as it connects eastern

Istanbul ) , postal_code_type = Postal code , postal_code = 34000 to 34990 , area_code = +90 212 (European side) +90 216 (Asian side) , registration_plate = 34 , blank_name_sec2 = GeoTLD , blank_i ...

and the heavily urbanized northeastern shore of the

Sea of Marmara The Sea of Marmara,; grc, Προποντίς, Προποντίδα, Propontís, Propontída also known as the Marmara Sea, is an inland sea located entirely within the borders of Turkey. It connects the Black Sea to the Aegean Sea via t ...

to the nation's capital,

Ankara Ankara ( , ; ), historically known as Ancyra and Angora, is the capital of Turkey. Located in the central part of Anatolia, the city has a population of 5.1 million in its urban center and over 5.7 million in Ankara Province, maki ...

. The O-4 also makes up part of the

International E-road network The international E-road network is a numbering system for roads in Europe developed by the United Nations Economic Commission for Europe (UNECE). The network is numbered from E1 up and its roads cross national borders. It also reaches Cen ...

E80 and E89 as well as the AH-1 of the

Asian Highway Network The Asian Highway Network (AH), also known as the Great Asian Highway, is a cooperative project among countries in Asia and the United Nations Economic and Social Commission for Asia and the Pacific (ESCAP) to improve their connectivity via hi ...

. The O-4 is the longest completed motorway in Turkey spanning , just longer than the O-52. The partially-opened O-5 is expected to surpass the length of the O-4, when it is completed in 2019, with a total length of . but nowadays the longest motorway in Turkey is

Otoyol 21 Otoyol 21 ( en, Motorway 21), abbreviated as O-21, a.k.a. Ankara-Tarsus Otoyolu ( en, Ankara-Tarsus Motorway), is a completed toll motorway in the Central Anatolia and Mediterranean regions in Turkey. Currently, it is connecting Otoyol 20 from ...

with the opening

Niğde Niğde (; grc, Νίγδη; Hittite: Nahita, Naxita) is a city and the capital of Niğde province in the Central Anatolia region of Turkey at an elevation of 1,299 m. In 2017 the city population was 141,010 people. The city is small with plenty ...

section. Construction of the O-4 began in 1984 and was widely completed in 1992 except for a short gap through the mountains west of

Bolu Bolu is a city in Turkey, and administrative center of the Bolu Province. The population is 131,264 (2012 census). The city has been governed by mayor Tanju Özcan (Republican People's Party, CHP) since 2019 Turkish local elections, local electi ...

. This gap was connected in 2006, with the opening of the Mount Bolu Tunnel.

Route description

Istanbul

The O-4 begins at the intersection with the O-1. The next interchange is in northern Ataşehir with the

O-2 O2, O-2, o2, O2, O2, O2− or O2+ may refer to: Science and technology * or dioxygen, the common allotrope of the chemical element oxygen * , the ion oxide * , the ion superoxide * , the ion dioxygenyl * , doubly ionized oxygen * O2, an EEG ...

. 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 the Samandıra-Kartal connector, that is the first of several connections to the D.100. Exit K3 connects to Fatih Boulevard in Sultanbeyi. The interchange with the O-7 is located just as the O-4 enters the district of

Pendik Pendik is a district of Istanbul, Turkey on the Asian side between Kartal and Tuzla, on the Marmara Sea. Home to Sabiha Gökçen International Airport. Population is 711,894. It also neighbours Sultanbeyli, Sancaktepe and Çekmeköy from nor ...

. Exit K4 is located right on the eastern border of the Pendik district and connects to the

Sabiha Gökçen Airport Sabiha is an Arabic word () meaning "Morning" and a female given name. In Urdu it (خوبصورت، گوری چٹی) refers to beautiful, and blonde hair. People with the name include: People Given name *Sabiha Sultan (1894–1971), Ottoman princes ...

. After exit K4, the O-4 enters the last district in Istanbul,

Tuzla Tuzla (, ) is the third-largest city of Bosnia and Herzegovina and the administrative center of Tuzla Canton of the Federation of Bosnia and Herzegovina. As of 2013, it has a population of 110,979 inhabitants. Tuzla is the economic, cultural, e ...

. Exit K5 (Orhanlı junction) also offers a connection to the Sabiha Gökçen airport as well as the Kurtköy-Pendik connector. The O-4 continues through northern Tuzla, passing through mostly industrial parks until leaving the

Istanbul Province ) , postal_code_type = Postal code , postal_code = 34000 to 34990 , area_code = +90 212 (European side) +90 216 (Asian side) , registration_plate = 34 , blank_name_sec2 = GeoTLD , blank_in ...

and entering the

Kocaeli Province Kocaeli Province ( tr, Kocaeli ili, ) is a province of Turkey and one of only three not to have the same official name as its capital, İzmit, which is thus also sometimes called Kocaeli. The province is the successor of the Ottoman-era Sanjak ...

Kocaeli

After crossing into Kocaeli, exit K6 is the ''Şekerpınar-Çayırova connector'' in Şekerpınar. The O-4 traverses through northern Gebze until exit K7, which is a direct connection to the D-100. After crossing over the D-100, the O-4 interchanges with the northern end of the O-5 at the unnumbered Mualimköy junction. Following the junction, the motorway runs along the heavily industrialized northern shore of the Izmit Bay with exits at Diliskelisi (K8) and Hereke (K9, K10). Between Hereke and Körfez the motorway runs directly next to the D-100 and the Istanbul-Ankara railway along the shoreline until the motorway enters Körfez. Once in the city, Exit K11 connects to the D.100. Shortly after K11, an unmarked exit to a KGM employee housing facility. 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 of

İzmit İzmit () is a district and the central district of Kocaeli province, Turkey. It is located at the Gulf of İzmit in the Sea of Marmara, about east of Istanbul, on the northwestern part of Anatolia. As of the last 31/12/2019 estimation, the ...

. 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 the D.605, which can be accessed via Exit K12. After bypassing Izmit, the motorway heads southeast, crossing over the D.100 (Exit K13) in Bahçelievler. After the exit, the route enters

Sakarya Province Sakarya ( tr, ) is a province in Turkey, located on the coast of Black Sea. The Sakarya River creates a webbing of estuaries in the province, which is in the Marmara Region. The adjacent provinces are Kocaeli to the west, Bilecik to the sou ...

Sakarya

Otoyol 4 parallels the Istanbul-Ankara railway along the southern shore of Lake Sapanca except for its short bypass around the town of

Sapanca Sapanca is a town and district in the Sakarya Province in the Marmara region of Turkey near Lake Sapanca. The town's mayor is Özcan ÖZEN ( AKP). Sapanca has recently become a tourist destination, due to its stunning natural environment and it ...

. Exit K14 connects to the town, via İzmit Avenue.

Exit List

{, class="wikitable" , - !width=100, Province !!width=100, District !!width=40, km !!width=40, mi !!width=30, Exit !!width=300, Destination !!width=200, Notes , - , rowspan="8",

, rowspan="3",

Ümraniye Ümraniye () is a district of Istanbul. It was separated from Üsküdar in 1987. It is bordered by Çekmeköy to the northeast, Sancaktepe to the east, Ataşehir to the south, Üsküdar to the west and Beykoz to the northwest. History Ümraniye i ...

Ataşehir Ataşehir is a district of Istanbul, Turkey. It is located at the junction of the O-2 and O-4 motorways on the Anatolian (Asian) side of Istanbul. Its neighbours are the districts of Ümraniye to the north, Sancaktepe to the northeast, ...

, style='background: #dcdcdc', 0 , style='background: #dcdcdc', 0 , , K10 , , — FSM Bridge, Mahmutbey / — Çamlıca , , Connector to , - , style='background: #dcdcdc', 3.3 , style='background: #dcdcdc', 2.1 , , K1 , , Necip Fazıl Blvd. , , , - , style='background: #dcdcdc', , style='background: #dcdcdc', , colspan="3" style='background: #ccccff', , - , ,

Sancaktepe Sancaktepe is a district in the suburbs of Istanbul, Turkey. It became a district in the year 2009. History Sancaktepe's oldest historic structure is Damatris Summer Palace that was built by I. Tiberius Konstantinos (578–582) and Mavrikos (5 ...

, style='background: #dcdcdc', 7.9 , style='background: #dcdcdc', 4.9 , style='background: #ccccff', K2 , style='background: #ccccff', Kartal connector — Kartal , style='background: #ccccff', Connector to , - , ,

Sultanbeyli Sultanbeyli () is a district of Istanbul, Turkey, located inland on the Asian side ( Anadolu Yakasi) of the city. It has a population of 298,143 as of 2011, more than triple the 1990 figure of 82,298. The mayor is Hüseyin Keskin of the Justice ...

, style='background: #dcdcdc', 12.6 , style='background: #dcdcdc', 7.8 , style='background: #ccccff', K3 , style='background: #ccccff', Fatih Blvd. —

, style='background: #ccccff', , - , rowspan="2",

, style='background: #dcdcdc', 17.7 , style='background: #dcdcdc', 11 , style='background: #ccccff', K81 , style='background: #ccccff', — YSS Bridge,

Istanbul Airport Istanbul Airport ( tr, İstanbul Havalimanı, ) is the main international airport serving Istanbul, Turkey. It is located in the Arnavutköy district on the European side of the city. All scheduled commercial passenger flights were transfer ...

, style='background: #ccccff', , - , style='background: #dcdcdc', 20 , style='background: #dcdcdc', 12.4 , style='background: #ccccff', K4 , style='background: #ccccff', Pendik connector —

, style='background: #ccccff', Connector to , - , ,

, style='background: #dcdcdc', 21.6 , style='background: #dcdcdc', 13.4 , style='background: #ccccff', K5 , style='background: #ccccff', Airport connector — S. Gökçen Airport , style='background: #ccccff', , - , rowspan="13", Kocaeli , rowspan="2", Çayırova , style='background: #dcdcdc', 29.6 , style='background: #dcdcdc', 18.4 , style='background: #ccccff', K6 , style='background: #ccccff', Çayırova connector — Çayırova , style='background: #ccccff', Connector to , - , style='background: #dcdcdc', 31.4 , style='background: #dcdcdc', 19.5 , style='background: #ccccff', K6-1 , style='background: #ccccff', Muhsin Yazıcıoğlu Ave. — Gebze OSB , style='background: #ccccff', , - , rowspan="2", Gebze , style='background: #dcdcdc', 39.8 , style='background: #dcdcdc', 24.7 , style='background: #ccccff', K7 , style='background: #ccccff', — Gebze , style='background: #ccccff', , - , style='background: #dcdcdc', 42.2 , style='background: #dcdcdc', 26.2 , style='background: #ccccff', K1 , style='background: #ccccff', — Osman Gazi Bridge,

Bursa ( grc-gre, Προῦσα, Proûsa, Latin: Prusa, ota, بورسه, Arabic:بورصة) is a city in northwestern Turkey and the administrative center of Bursa Province. The fourth-most populous city in Turkey and second-most populous in the ...

, then

İzmir İzmir ( , ; ), also spelled Izmir, is a metropolitan city in the western extremity of Anatolia, capital of the province of the same name. It is the third most populous city in Turkey, after Istanbul and Ankara and the second largest urban aggl ...

, style='background: #ccccff', , - , , Dilovası , style='background: #dcdcdc', 46 , style='background: #dcdcdc', 28.6 , style='background: #ccccff', K8 , style='background: #ccccff', Liman Ave. — Dilovası , style='background: #ccccff', , - , rowspan="3", Körfez , style='background: #dcdcdc', 52.1 , style='background: #dcdcdc', 32.3 , style='background: #ccccff', K9 , style='background: #ccccff', — Hereke , style='background: #ccccff', Eastbound exit, westbound entrance , - , style='background: #dcdcdc', 54.5 , style='background: #dcdcdc', 33.7 , style='background: #ccccff', K10 , style='background: #ccccff', — Hereke , style='background: #ccccff', Eastbound entrance, westbound exit , - , style='background: #dcdcdc', 67.9 , style='background: #dcdcdc', 42.2 , style='background: #ccccff', K11 , style='background: #ccccff', — Körfez , style='background: #ccccff', , - , , Derince , style='background: #dcdcdc', 75.1 , style='background: #dcdcdc', 46.7 , style='background: #ccccff', K12 , style='background: #ccccff', —

, style='background: #ccccff', Eastbound exit, westbound entrance , - , rowspan="3",

, style='background: #dcdcdc', , style='background: #dcdcdc', , colspan="3" style="text-align:center;" , Korutepe Tunnel , - , style='background: #dcdcdc', , style='background: #dcdcdc', , colspan="3" style="text-align:center;" , Gültepe Tunnel , - , style='background: #dcdcdc', 86.8 , style='background: #dcdcdc', 53.9 , style='background: #ccccff', K13 , style='background: #ccccff', —

, Kandıra , style='background: #ccccff', , - , ,

Kartepe Kartepe is a town and district of Kocaeli Province, Turkey. The mayor is Şükrü Karabalık ( AKP). Geography Kartepe (literally Snowy hill referring to mountains to the south) is situated at to the east of Kocaeli Gulf. It is almost merg ...

, style='background: #dcdcdc', 94.2 , style='background: #dcdcdc', 58.5 , style='background: #ccccff', K14 , style='background: #ccccff', —

, style='background: #ccccff', , - , rowspan="4", Sakarya , ,

, style='background: #dcdcdc', 101.5 , style='background: #dcdcdc', 63.1 , style='background: #ccccff', K15 , style='background: #ccccff', —

, style='background: #ccccff', , - , ,

Arifiye Arifiye is a district center of Sakarya Province, Turkey. It is also included in Greater Sakarya Proper. Geography Arifiye is situated at just at the east of Lake Sapanca. It is almost merged to Adapazarı the center of the province and it i ...

, style='background: #dcdcdc', 114.1 , style='background: #dcdcdc', 70.9 , style='background: #ccccff', K16 , style='background: #ccccff', —

, Sakarya , style='background: #ccccff', , - , , Akyazı , style='background: #dcdcdc', 130.8 , style='background: #dcdcdc', 81.3 , style='background: #ccccff', K17 , style='background: #ccccff', — Akyazı , style='background: #ccccff', , - , , Hendek , style='background: #dcdcdc', 137.4 , style='background: #dcdcdc', 85.4 , style='background: #ccccff', K18 , style='background: #ccccff', Hendek connector — Hendek , style='background: #ccccff', Connector to , - , rowspan="2",

Düzce Düzce is the capital city of Düzce Province, the eighty-first Province in Turkey. The population is 367,087 and in 2009 was 125,240, an increase from 61,878 in 1990. Overview Düzce is the eighty-first and the newest province of Turkey ...

, rowspan="2", Düzce Merkez , style='background: #dcdcdc', 169 , style='background: #dcdcdc', 105 , style='background: #ccccff', K19 , style='background: #ccccff', —

, style='background: #ccccff', , - , style='background: #dcdcdc', 189.8 , style='background: #dcdcdc', 117.9 , style='background: #ccccff', K20 , style='background: #ccccff', —

Kaynaşlı Kaynaşlı is a town and a district of Düzce Province in the Black Sea region of Turkey Turkey ( tr, Türkiye ), officially the Republic of Türkiye ( tr, Türkiye Cumhuriyeti, links=no ), is a transcontinental country located mainly o ...

, style='background: #ccccff', , - , rowspan="7",

, rowspan="4", Bolu Merkez , style='background: #dcdcdc', , style='background: #dcdcdc', , colspan="3" style="text-align:center;" , Mount Bolu Tunnel , - , style='background: #dcdcdc', 200.9 , style='background: #dcdcdc', 124.8 , style='background: #ccccff', K21 , style='background: #ccccff', — Abant , style='background: #ccccff', , - , style='background: #dcdcdc', 207.9 , style='background: #dcdcdc', 129.2 , style='background: #ccccff', K22 , style='background: #ccccff', —

, style='background: #ccccff', Bolu west , - , style='background: #dcdcdc', 227.1 , style='background: #dcdcdc', 141.1 , style='background: #ccccff', K23 , style='background: #ccccff', —

, style='background: #ccccff', Bolu east , - , , Yeniçağa , style='background: #dcdcdc', 249.6 , style='background: #dcdcdc', 155.1 , style='background: #ccccff', K24 , style='background: #ccccff', — Yeniçağa , style='background: #ccccff', , - , rowspan="2",

Gerede Gerede is a town and a district of Bolu Province in the Black Sea region of Turkey. It is located on the highway from Istanbul to Ankara (approximately from Ankara, where the road to the Black Sea coast branches off). It covers an area of , and ...

, style='background: #dcdcdc', 259.5 , style='background: #dcdcdc', 161.2 , style='background: #ccccff', K25 , style='background: #ccccff', — Dörtdivan , style='background: #ccccff', , - , style='background: #dcdcdc', 266.2 , style='background: #dcdcdc', 165.4 , style='background: #ccccff', K26 , style='background: #ccccff', Gerede connector —

/ —

Karabük Karabük is a town and the capital district of Karabük Province in the Black Sea region of Turkey. According to the 2009 census, population of the city is 108 167. The district covers an area of , and the town lies at an elevation of . Karabü ...

, style='background: #ccccff', , - , rowspan="6",

, , Çamlıdere , style='background: #dcdcdc', 311.1 , style='background: #dcdcdc', 193.3 , style='background: #ccccff', K27 , style='background: #ccccff', — Çamlıdere , style='background: #ccccff', , - , ,

Kızılcahamam Kızılcahamam is a town and district of Ankara Province in the Central Anatolia region of Turkey, 70 km north of the city of Ankara, near the motorway to Istanbul. According to 2010 census, population of the district is 25,203 of which 16,72 ...

, style='background: #dcdcdc', 326.9 , style='background: #dcdcdc', 203.1 , style='background: #ccccff', K28 , style='background: #ccccff', —

Güdül Güdül is a rural town and district of Ankara Province in the Central Anatolia region of Turkey, 90 km north-west of the city of Ankara, off the motorway to Istanbul. The district covers an area of 419 km², and the average elevation is ...

, style='background: #ccccff', , - , rowspan="3",

Kazan Kazan ( ; rus, Казань, p=kɐˈzanʲ; tt-Cyrl, Казан, ''Qazan'', IPA: Help:IPA/Tatar, ɑzan is the capital city, capital and largest city of the Republic of Tatarstan in Russia. The city lies at the confluence of the Volga and t ...

, style='background: #dcdcdc', , style='background: #dcdcdc', , colspan="3" style='background: #ccccff', , - , style='background: #dcdcdc', 359.7 , style='background: #dcdcdc', 223.5 , , K29 , , Fevzi Çakmak Ave. —

Kahramankazan Kahramankazan (previously named Kazan) is a town and district of the Ankara Province in the Central Anatolia region of Turkey, standing on the plain of Akıncı to the north west of the city of Ankara. According to 2010 census, population of the ...

, , , - , style='background: #dcdcdc', 360.8 , style='background: #dcdcdc', 224.2 , , - , , — Mürted Air Base , , , - , ,

Yenimahalle Yenimahalle is a metropolitan district of Ankara Province in the Central Anatolia region of Turkey, a fast-growing urban residential district of the city of Ankara, Turkey's capital. According to 2010 census, population of the urban center is 648 ...

, style='background: #dcdcdc', 371.7 , style='background: #dcdcdc', 231 , , K1 , , —

, , Ankara Beltway

External links

Istanbul road mapAnkara road map

References

{{coord missing, Turkey AH1 04 Transport in Istanbul Province Transport in Kocaeli Province Transport in Sakarya Province Transport in Düzce Province Transport in Bolu Province Transport in Ankara Province Toll roads in Turkey Akyazı District