KSCE Journal of Civil Engineering

, Volume 20, Issue 1, pp 411–420 | Cite as

Modeling the critical position of U-turning vehicles at uncontrolled median openings

  • Smruti Sourava Mohapatra
  • Partha Pratim Dey
  • Satish Chandra
Transportation Engineering

Abstract

The present study provides a methodology for identification of the conflict zone between a turning vehicle and on-coming vehicles at uncontrolled median openings on urban roads under mixed traffic conditions. Data for turning movements of different types of vehicles were collected at 13 median openings on 6-lane roads and 8 median openings on 4-lane roads in different cities of India. These data are analyzed statistically and it was found that the critical position (path of the outer wheel) of a vehicle is influenced by the vehicle size and the road width. In the case of 6-lane roads, the critical position of turning vehicle may follow a unimodal or bimodal distribution depending upon the proportion of motorized two-wheelers (2-W) in the turning volume. On 4-lane roads, the gamma distribution was found to fit the placement data at all the eight sections. A simple model is proposed to identify the boundary of the conflict zone at median openings. The geometrical augmentation required at the median opening in order to avoid the conflict between turning vehicles and through traffic in the opposing median lane is also suggested.

Keywords

critical position median opening U-turns merging conflict mixed traffic 

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Copyright information

© Korean Society of Civil Engineers and Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Smruti Sourava Mohapatra
    • 1
  • Partha Pratim Dey
    • 1
  • Satish Chandra
    • 2
  1. 1.School of InfrastructureIndian Institute of Technology BhubaneswarBhubaneswarIndia
  2. 2.Dept. of Civil EngineeringIndian Institute of Technology RoorkeeRoorkeeIndia

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