The results of the critical gaps research on freeway interchanges in the Russian Federation have presented in this paper. The project finished in 2017 and its main target is to improve the capacity technique. During the period of the Soviet Union, most of interchange design approaches were developed in the middle of the 80th of last century. A lot of things have changed over the past 40 years: daily volumes, structure of traffic flows, cars and trucks dynamic, as well as drivers’ behavior. The subject of study is the dependence of the confluence zone capacity of traffic flow from its length. The results of current project allowing to consider the actual traffic conditions at freeway interchanges in Russia and features of drivers’ behavior.

Freeway interchange, critical gaps, acceleration lane, road design, interchange capacity, confluence zone.