Estimation of Passenger Car Units for Different Category of Vehicles in Midblock

Eshetu Zekarias Lera¹ , Mengistu Mena Kuleno²

Section:Research Paper, Product Type: Journal-Paper
Vol.7 , Issue.2 , pp.8-19, Jun-2020

Online published on Jun 30, 2020

Copyright © Eshetu Zekarias Lera, Mengistu Mena Kuleno . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
The mixed traffic flow magnifies the impact of one vehicle on another. The present study was carried out to estimate traffic stream speed to study the effect of increased flow volume of individual vehicle category to the speed. In order to achieve the desired objectives, Percentage composition of each vehicle category was prepared for each survey day and average stream speed with classified traffic volume was modelled using SPSS. The passenger car unit of individual vehicles has been estimated from the speed prediction model by taking the ratio of speed reduction coefficient of each vehicle category to that of standard vehicle. The effects of traffic volume and its composition on stream speed and dynamic passenger car unit in the context of urban mixed traffic has been analyzed. Based on the result obtained, passenger car unit of light vehicles increase with increase in road width for given composition, but it decreases with the road width for heavier vehicles. The result also indicated that passenger car unit of all vehicles category increases with increase in percentage composition of heavy vehicles except two wheelers and also the passenger car units of all vehicles category decrease with an increase in traffic stream speed for the given road width due to the fact that the impact of fast-moving vehicles to the nearby vehicle is high and hence the passenger car unit of that vehicle is higher than slow-moving one

Key-Words / Index Term :
mixed traffic flow, passenger car unit, reference vehicles, speed reduction coefficient

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