|Part of and|
|Length:||232 km (144 mi)|
|To:||Mahmutbey East, Istanbul|
|Provinces:||Edirne, Kırklareli, Tekirdağ, Istanbul|
|Major cities:||Edirne, Istanbul|
Otoyol 3 (English: Motorway 3), abbreviated as , a.k.a. Avrupa Otoyolu (English: Europe Motorway), is a toll motorway in Marmara Region's Eastern Thrace section in Turkey, connecting the cities Edirne and Istanbul. From its western terminus to the junction with O-2, it is part of international routes as of European and Asian . O-3 is one of the busiest motorways in Turkey alongside O-4.
The motorway starts at Edirne West, where it joins the coming from the checkpoint Kapıkule at Bulgarian border, Turkey's gateway to Europe. It runs south-eastwards bypassing the city in the north and terminates in Istanbul, linking to the two beltways of Istanbul and . The 240 km (150 mi) long motorway passes through the provinces Edirne, Kırklareli, Tekirdağ and Istanbul.
Between Edirne-Silvri is continuously 6 lanes (3 by 2). Silivri-Istanbul part is also 6 lanes but there are some sections where it is 4 lanes (2 by 2).
|Edirne West||Eastbound only
Continues westbound as
Last exit before toll plaza
|Kirklareli||Babaeski Service Area|
|27.2||62.9||K5||() – Babaeski|
|Çorlu Service Area|
|Selimpaşa Service Area|
|Lake Büyükçekmece Bridge|
|Toll Plaza Mahmutbey West|
||Mahmutbey East||(, )|
- Turkish General Directorate of Highways. Turkey road map. 2009.
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