Otoyol 4

O-4
Anadolu Otoyolu
Route information
Part of E80 E89
Part of AH1
Length	372 km (231 mi)
Existed	1984–present
Major junctions
West end	O-1, in Istanbul
Major intersections	O-2 in Ataşehir O-7 in Sultanbeyli D.100 in Gebze O-5 in Gebze D.605 in Izmit D.650 in Arifiye
East end	O-20 in Ankara
Location
Country	Turkey
Regions	Marmara, Black Sea, Central Anatolia
Provinces	Istanbul, Kocaeli, Sakarya, Düzce, Bolu, Ankara
Major cities	Istanbul, Izmit, Bolu, Ankara
Highway system
Highways in Turkey Motorways List State Highways List
← O-3 → O-5

Çamlıca Toll plaza on the east end of Otoyol 4 in Istanbul.

Kızılcahamam Toll plaza on the O-4

Otoyol 4 (English: Motorway 4), named Anatolian Motorway (Turkish : Anadolu Otoyolu) and abbreviated as O-4, is a toll motorway connecting the northwestern Marmara Region to the Central Anatolia Region 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 and the heavily urbanized northeastern shore of the Sea of Marmara to the nation's capital, Ankara. The O-4 also makes up part of the International E-road network E80 and E89 as well as the AH-1 of the Asian 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 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 407 km (253 mi). but nowadays the longest motorway in Turkey is Otoyol 21 with the opening Ankara-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 of Bolu. 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 . ^[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 the Samandıra-Kartal connector, that is the first of several connections to the D.100. ^[2] Exit K3 connects to Fatih Boulevard in Sultanbeyi. ^[3] The interchange with the O-7 is located just as the O-4 enters the district of Pendik. Exit K4 is located right on the eastern border of the Pendik district and connects to the Sabiha 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 the Kurtköy-Pendik connector. ^[5] The O-4 continues through northern Tuzla, passing through mostly industrial parks until leaving the Istanbul Province and entering the Kocaeli Province.

Kocaeli

After crossing into Kocaeli, exit K6 is the Şekerpınar-Çayırova connector in Şekerpınar. ^[6] The O-4 traverses through northern Gebze 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 the O-5 at the unnumbered Mualimköy junction. ^[8] Following the junction, the motorway runs along the heavily industrialized northern shore of the Izmit 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 the Istanbul-Ankara railway along the shoreline until the motorway enters Körfez. 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 of İzmit. 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. ^[14] After bypassing Izmit, the motorway heads southeast, crossing over the D.100 (Exit K13 ^[15] ) in Bahçelievler. After the exit, the route enters Sakarya Province.

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. Exit K14 connects to the town, via İzmit Avenue. ^[16]

Exit List

Province	District	km	mi	Exit	Destination	Notes
Istanbul	Ümraniye/Ataşehir	0	0	K10	O-2 — FSM Bridge, Mahmutbey / P.34-12 — Çamlıca	Connector to O-1
		3.3	2.1	K1	Necip Fazıl Blvd.
				Samandıra Toll Plaza
	Sancaktepe	7.9	4.9	K2	Kartal connector — Kartal	Connector to D.100
	Sultanbeyli	12.6	7.8	K3	Fatih Blvd. — Sultanbeyli
	Pendik	17.7	11	K81	O-7 — YSS Bridge, Istanbul Airport
		20	12.4	K4	Pendik connector — Pendik	Connector to D.100
	Tuzla	21.6	13.4	K5	Airport connector — S. Gökçen Airport
Kocaeli	Çayırova	29.6	18.4	K6	Çayırova connector — Çayırova	Connector to D.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	K1	O-5 — Osman Gazi Bridge, Bursa, then İzmir
	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 to D.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
		359.7	223.5	K29	Fevzi Çakmak Ave. — Kahramankazan
		360.8	224.2	-	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       Tolled

External links

• Istanbul road map
• Ankara road map

References

1. Google (25 July 2017). "Ataşehir interchange" (Map). Google Maps . Google. Retrieved 25 July 2017.
2. Google (25 July 2017). "Exit K2" (Map). Google Maps . Google. Retrieved 25 July 2017.
3. Google (25 July 2017). "Exit K3" (Map). Google Maps . Google. Retrieved 25 July 2017.
4. Google (25 July 2017). "Exit K4" (Map). Google Maps . Google. Retrieved 25 July 2017.
5. Google (25 July 2017). "Exit K5" (Map). Google Maps . Google. Retrieved 25 July 2017.
6. Google (25 July 2017). "Exit K6" (Map). Google Maps . Google. Retrieved 25 July 2017.
7. Google (25 July 2017). "Exit K7" (Map). Google Maps . Google. Retrieved 25 July 2017.
8. Google (25 July 2017). "Mualimköy interchange" (Map). Google Maps . Google. Retrieved 25 July 2017.
9. Google (25 July 2017). "Exit K8" (Map). Google Maps . Google. Retrieved 25 July 2017.
10. Google (25 July 2017). "Exit K9" (Map). Google Maps . Google. Retrieved 25 July 2017.
11. Google (25 July 2017). "Exit K10" (Map). Google Maps . Google. Retrieved 25 July 2017.
12. Google (25 July 2017). "Exit K11" (Map). Google Maps . Google. Retrieved 25 July 2017.
13. Google (25 July 2017). "KGM unmarked exit" (Map). Google Maps . Google. Retrieved 25 July 2017.
14. Google (25 July 2017). "Exit K12" (Map). Google Maps . Google. Retrieved 25 July 2017.
15. Google (25 July 2017). "Exit K13" (Map). Google Maps . Google. Retrieved 25 July 2017.
16. Google (25 July 2017). "Exit K14" (Map). Google Maps . Google. Retrieved 25 July 2017.