 The first part of the six-lane motorway to be completed east of Zagreb was the section between Ivanja Reka and Lipovljani, immediately to the east of the present day Lipovljani rest area; this was done in 1980.In order to maintain the flow of traffic on the Zagreb–Belgrade road during construction, the southern carriageway was completed first, and then the two-way traffic was rerouted to the new carriageway while the old, northern carriageway was widened and its pavement structure was replaced with a new one.Similarly, as the new carriageway extended further eastward, the at-grade intersections were replaced by interchanges or flyovers.