CONTRIBUTION TO BASIC PARAMETERS ANALYSIS OF THE TRAFFIC FLOW ON TWO-LANE HIGHWAYS IN THE FUNCTION OF DIRECTIONAL SPLIT OF TRAFFIC FLOW OF PASSENGER CARS

In this paper the regularity of the changes of basic traffic flow parameters (flow rate, speed, and density) on the two-lane highway sections of ideal geometry, with the traffic flow of passenger cars being equal to the practical capacity, is analyzed in the function of directional split of passenger car (PC) traffic flow. The critical review of the way in which this question was treated in the Highway Capacity Manual (HCM), the leading publication dealing with the problems about the road capacity, is performed. Finally, all three basic traffic flow parameters (flow rate, speed and density) for the capacity of two lane highway section of ideal geometry and known PC-traffic flow, in the function of directional split of traffic flow, were defined.