Provincial road 34-12 ( tr, İl yolu 34-12), named the O1-O2 connector ( tr, O1-O2 bağlantısı) is a {{convert, 6.9, km, abbr=on long

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 i ...

Istanbul Istanbul ( , ; tr, İstanbul ), formerly known as Constantinople ( grc-gre, Κωνσταντινούπολις; la, Constantinopolis), is the List of largest cities and towns in Turkey, largest city in Turkey, serving as the country's economic, ...

Turkey Turkey ( tr, Türkiye ), officially the Republic of Türkiye ( tr, Türkiye Cumhuriyeti, links=no ), is a list of transcontinental countries, transcontinental country located mainly on the Anatolia, Anatolian Peninsula in Western Asia, with ...

. The motorway is a

connector Connector may refer to: Hardware *Plumbing * Electrical connector, a device for joining electrical circuits together (sometimes known as ports, plugs, or interfaces) ** Gender of connectors and fasteners ** AC power plugs and sockets, devices tha ...

route linking the motorway O-1 (Istanbul Inner Beltway) to the motorway

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 ...

(Istanbul Outer Beltway), where it becomes the O-4 (Anatolian Motorway). The route is one of two motorways linking the two beltways on the Asian side of the city, the other being the

Şile Motorway Şile is a city and district in Istanbul, Turkey. According to the 2007 census, the population of the district was 25,169, of which 9,831 lived in the city of Şile, 2,096 in the nearby town of Ağva (Yeşilçay) and 13,242 in surrounding village ...

. The O1-O2 connector was opened in 1991.

Route description

The O1-O2 connector begins at ''Anadolu Interchange'' in

Üsküdar Üsküdar () is a large and densely populated district of Istanbul, Turkey, on the Anatolian shore of the Bosphorus. It is bordered to the north by Beykoz, to the east by Ümraniye, to the southeast by Ataşehir and to the south by Kadıköy; w ...

, where it diverges from the O-1. The two-lane motorway heads east right on the border of the Ataşehir/Üsküdar and later the Ataşehir/Ümraniye district line. Transport in Istanbul Province Provincial roads in Turkey Üsküdar Ataşehir