A single-lane carriageway, it bears heavy car and truck traffic between major cities of Belgrade, Čačak, Kraljevo and Novi Pazar, as well as transit traffic towards Montenegro, and occasional agricultural machinery is not unseen. If features long stretches of straight road interrupted by dangerous curves. Speeding,
DUI and other
traffic offences are major causes of accidents, most of them occurring during the night. In three-year span from 2017 to 2019, a total of 1,736 traffic accidents happened on its route, with 86 deaths and 1,619 injured people. Before the completion of motorway on section from Belgrade to Čačak, with more than 18,000 vehicles passing the highway daily (as of 2016), it was one of the most frequent roads in Serbia. Often called the "black highway", it is considered the most dangerous road in Serbia, averaging several hundreds traffic accidents annually. ==Sections==