The article presents the most frequently recommended and practically applied models for calculating passenger car equivalents for heavy vehicles. These models include those used in the currently applicable methods for calculating intersection capacity in Poland, models proposed in successive editions of the HCM (Highway Capacity Manual) in the USA, and models based on the analysis of headways between vehicles in homogeneous and mixed traffic streams. The final part of the article presents the results of the author’s own research aimed at determining the value of the passenger car equivalent for heavy vehicles at small single-lane roundabout intersections.Intersection and road segment capacity is most often expressed in passenger car equivalents per hour [PCE/h]. In general terms, capacity is the maximum number of vehicles that can pass a given (conventional) cross-section of a road or intersection approach per unit of time. In turn, the presence of heavy and simultaneously slower vehicles in the traffic stream significantly affects the reduction of capacity. (…)
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Source: Logistyka Magazine