High Quality Content by WIKIPEDIA articles! The A3 motorway (Croatian: Autocesta A3) 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. The motorway has a positive economic impact on the cities and towns it connects, and is an important route within Croatia.