This is a list of roads designated A3. Roads entries are sorted in the countries alphabetical order.
A controlled-access highway is a type of highway that has been designed for high-speed vehicular traffic, with all traffic flow—ingress and egress—regulated. Common English terms are freeway, motorway, and expressway. Other similar terms include throughway or thruway and parkway. Some of these may be limited-access highways, although this term can also refer to a class of highways with somewhat less isolation from other traffic.
Controlled-access highways in Hungary are dual carriageways, grade separated with controlled-access, designed for high speeds. The legislation amendments define two types of highways: motorways and expressways.
The A3 motorway is a major motorway in Croatia spanning 306.5 kilometres (190.5 mi). The motorway connects Zagreb, the nation's capital, to the Slavonia region and a number of cities along the Sava River. It represents a major east–west transportation corridor in Croatia and a significant part of the Pan-European Corridor X, serving as a transit route between the European Union states and the Balkans. Apart from Zagreb, where the A3 motorway comprises a considerable part of the Zagreb bypass, the motorway runs near a number of significant Croatian cities.
Highways in Croatia are the main transport network in Croatia. The Croatian classification includes several classes of highways:
The state road D1 is a national highway in Croatia. It is a one-lane highway that spans from Macelj border crossing in the north via Krapina, Zagreb, Karlovac, Slunj, Gračac, Knin, Sinj, ending in Split. It is 421.2 kilometres (261.7 mi) long overall.
Motorways in Serbia are called auto-put, a name which simply means car-road. Roads that are motorways are categorized as state roads of IA category and are marked with one or two digit numbers. Motorways in Serbia have three lanes in each direction, signs are white-on-green, and the normal speed limit is 130 km/h (81 mph). They are maintained and operated by the national road operator company JP "Putevi Srbije".
Adriatic–Ionian motorway or Trieste-Kalamata Highway or the Blue Corridor, is a future motorway that will stretch along the entire eastern shore of the Adriatic and Ionian seas, spanning the western coast of the Balkan peninsula from Italy in the north through Slovenia, Croatia, Montenegro, Albania to Greece in the south.
This article describes the highway systems available in selected countries.
D2 state road is a trunk state road in the northern areas of Croatia that spans from the border crossing with Slovenia at Dubrava Križovljanska in the west via Varaždin, Koprivnica, Virovitica, Našice, Osijek, Vukovar, ending at the Ilok–Bačka Palanka Bridge border crossing with Serbia. The road is 347.9 km (216.2 mi) long.