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|---|---|---|---|---|
| European Motorway Avrupa Otoyolu | ||||
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| Route information | ||||
Part of  E80 | ||||
Part of  AH1 and  AH5 | ||||
| Length | 245 km (152 mi) | |||
| Existed | 1987–present | |||
| Major junctions | ||||
| West end |  D.100 near Edirne | |||
 D.555 near Karamesutlu O-7 in Mahmutbey, Istanbul O-2 in Mahmutbey, Istanbul | ||||
| East end |  O-1 in Eyüp, Istanbul | |||
| Location | ||||
| Country | Turkey | |||
| Regions | Marmara | |||
| Provinces | Edirne, Kırklareli, Tekirdağ, Istanbul | |||
| Major cities | Edirne, Istanbul | |||
| Highway system | ||||
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O-3Otoyol 3 (English: Motorway 3), also known as the European Motorway (Turkish: Avrupa Otoyolu) and abbreviated as the O-3 is a 245.1 km (152.3 mi) long otoyol in East Thrace, Turkey. The O-3 runs from Edirne to Istanbul and is the only motorway in Turkey located entirely in Europe. The motorway begins west of Edirne at a junction with the D.100 where it then continues as a beltway passing just north of Edirne. From there, the motorway passes through mostly rural farmland until it enters the Istanbul metropolis near Silivri. The eastern end of the O-3 is at the interchange with the O-1, where the motorway becomes Vatan Caddesi and continues into the historic peninsula of Istanbul as a major boulevard.
The O-3 connects with three other motorways, all in Istanbul; the O-1, O-2 and the O-7; and is a part of the E80, the International E-road network and AH1 of the Asian Highway Network. The motorway has six lanes, three in each direction, except for a 44.6 km (27.7 mi) section between Silivri and Esenyurt.