| Srem, Belgrade|| 92.5 km|
| A3 at Batrovci broder crossing|
(Belgrade bypass) at Dobanovci interchange
Belgrade, Sremska Mitrovica, Ruma
The A3 motorway (Serbian: Аутопут А3 / Autoput A3) in Serbia spans approximately 92 kilometers (57 mi) and is part of the European route E70 through Serbia. It crosses the Srem region from east to west, starting at Batrovci border crossing with Croatia and ending at Belgrade bypass (A1 motorway) on Dobanovci interchange.
A3 motorway (Serbia) Wikipedia
The Batrovci–Belgrade section is part of the old Belgrade-Zagreb highway, known as Brotherhood and Unity Highway in the socialist era. It is a continuation to Croatian A3 highway, whose last section, from Slavonski Brod to Lipovac was completed to four lanes in 2006. From the Lipovac–Batrovci border crossing near Šid, it continues eastwards, along the towns of Sremska Mitrovica, Ruma and Stara Pazova. Few kilometers on the east, the major Dobanovci interchange is located, where A3 meets the Belgrade bypass, allowing transit traffic to bypass Belgrade. The bypass branches southwards across the Ostružnica Bridge towards the Ibar highway, southern branch of the A1 motorway (Serbia) (Belgrade–Niš) and the future A2 motorway; and northwards to the northern branch of A1 (Belgrade–Subotica). The A3 highway continues as a motorway through Belgrade (as currently non-designated route) and enters the New Belgrade and Zemun outskirts. It crosses the Sava river at the Gazela bridge.
The main toll stations of the A3 are located near Batrovci and Stara Pazova (Šimanovci). The section from Šimanovci to Belgrade is toll-free, serving as a main city artery. It includes the exit to Nikola Tesla Airport, located just south of the A3.
The Belgrade–Zagreb highway was built after the World War II, by the young volunteers, and opened on 28 July 1950, first as a single carriageway. The second carriageway from Šid to Belgrade was completed in 1987.