The A3 motorway (Serbian: Аутопут А3, romanized: Autoput A3) is a motorway in Serbia which spans approximately 92 kilometers (57 mi) and is part of the European route E70 through Serbia. It crosses the Syrmia region from east to west, starting at Belgrade and ending at the border crossing with Croatia.

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Autoput A 3
Serbian: Autoput A3 Serbian Cyrillic: Аутопут А3
Route information
Part of E70
Maintained by JP "Putevi Srbije"
Length	92.5 km (57.5 mi)
Major junctions
From	A3 E70 at Batrovci border with Croatia
Major intersections	21 A8 at Ruma
To	A1 E75 (Belgrade bypass) at Dobanovci interchange
Location
Country	Serbia
Major cities	Sremska Mitrovica, Ruma, Belgrade
Highway system
Roads in Serbia Motorways
← A2 → A4

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The A3 motorway begins near Šid, at the Batrovci border crossing with Croatia, and runs westward across the Syrmia region, near Sremska Mitrovica and Ruma. At the Dobanovci interchange near the outskirts of Belgrade, A3 meets the Belgrade bypass. East od Dobanovci, the A3 continues through Belgrade as the Belgrade city motorway (Serbian: Аутопут кроз Београд), a 29 km (18 mi) long urban highway which ends at Bubanj Potok interchange where it meets the A1.

The main toll stations of the A3 are located at Batrovci near Šid and Šimanovci near Dobanovci. The Belgrade city motorway section between Šimanovci and Bubanj Potok interchanges is toll-free, serving as one of main city arteries. It includes the exit to Nikola Tesla Airport, located just south of the A3.

The A3 motorway is part of the old Belgrade-Zagreb motorway, known as Brotherhood and Unity Highway which was built after World War II, by young volunteers, and opened to traffic in 1950, first as a single carriageway.^[1] The second carriageway from Belgrade to Sremska Mitrovica was completed in 1977, while the section from Sremska Mitrovica to Šid was opened to traffic in 1987.^{[citation needed]}

• Transport in Serbia
• National Road (M)1