TheA3 motorway (Serbian:Аутопут А3,romanized: Autoput A3) is amotorway in Serbia which spans 95 kilometers (59 mi) and is part of theEuropean route E70 through Serbia. It crosses theSyrmia region from east to west, starting atBelgrade and ending at the border crossing withCroatia.

Autoput A 3
Serbian:Autoput A3 Serbian Cyrillic:Аутопут А3
Route information
Part ofE70
Maintained by JP "Putevi Srbije"
Length	95.444 km[1] (59.306 mi)
Major junctions
From	A3E70 at Batrovci border withCroatia
Major intersections	21A8 at Ruma
To	A1E75 (Belgrade bypass) atDobanovci interchange
Location
Country	Serbia
Major cities	Sremska Mitrovica,Ruma,Belgrade
Highway system
Roads in Serbia Motorways
←A2 →A4

The A3 motorway begins nearŠid, at theBatrovci border crossing with Croatia, and runs westward across theSyrmia region, nearSremska Mitrovica andRuma. It ends in theDobanovci interchange near the outskirts of Belgrade where it meets the A1.

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

The A3 motorway is part of the old Belgrade-Zagreb motorway, known asBrotherhood and Unity Highway which was built afterWorld War II, by young volunteers, and opened to traffic in 1950, first as a single carriageway.^[2] 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

• Regulation of State Roads