An Investigation of Heavy Vehicle Effect on Traffic Circles

Serhan Tanyel; S. Pelin Çalışkanelli; Metin Mutlu Aydın; Seçil Başak Utku

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Year 2013, Volume: 24 Issue: 120, - , 01.01.2013

Serhan Tanyel S. Pelin Çalışkanelli Metin Mutlu Aydın Seçil Başak Utku

Abstract

Composition of traffic flow is one of the most important factors which affect operations at intersections. The effect of different vehicle types in a flow may be reflected by using passenger car equivalence (PCE) values. In this study, it is intended to determine the effect of heavy vehicles, particularly buses that are the most observed heavy vehicle type in urban traffic, on traffic circles. Data of the study are obtained from five different traffic circles in İzmir. The results show that when calculating the heavy vehicle adjustment factor (fHV), different PCE values should be used for minor and major flows. Using the same PCE value for both kind of flows may lead engineers to overdesign or make inadequate designs. Furthermore, it was determined that the effect of heavy vehicles on the major flow was greater when the mean speed of the major flow was low

Keywords

Traffic circle, passenger car equivalence, heavy vehicle, traffic flow

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