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Passenger Car Equivalents for the Heterogeneous Traffic on Divided Rural Highways Based on Simulation Model

  • Syed Omar Ballari
  • Pranab Kar
  • Mallikarjuna Chunchu
Original Article
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Abstract

Passenger car equivalent (PCE) values are necessary for representing a traffic stream composing of different vehicle types in terms of a passenger car equivalent stream. For no lane-based heterogeneous traffic streams observed in India, previous studies mostly have suggested the vehicle-specific PCE values that vary dynamically with the flow rate and the traffic composition. The objective of this paper is to estimate and analyze the implications of the vehicle-specific PCE values that do not vary with the LOS and certain range of traffic composition, for the four-lane and the six-lane divided rural roads. Besides, the present study has also estimated the aggregate PCEs for the four-lane and the six-lane divided roads. The PCE values were estimated based on the macroscopic relationships generated for the base and the heterogeneous traffic streams. For defining the level of service, a new performance measure termed as the speed drop was chosen and it was found that it provides a relatively more accurate PCEs. Results show that for a particular traffic mix, constant PCEs can be used across different levels of service without much loss of accuracy. Aggregate PCEs for a particular traffic mix vary with the speed drop markedly at lower flow rates.

Keywords

Passenger car equivalent Level of service Multilane highways Performance measure Heterogeneous traffic Constant PCE Aggregate PCE 

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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  • Syed Omar Ballari
    • 1
  • Pranab Kar
    • 2
  • Mallikarjuna Chunchu
    • 2
  1. 1.Holy Mary Institute of Technology and ScienceHyderabadIndia
  2. 2.Department of Civil EngineeringIndian Institute of Technology GuwahatiGuwahatiIndia

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