Factors Affecting Driver Speed Choice Behaviour in a Two-Lane Two-Way Heterogeneous Traffic Environment: A Micro-level Analysis

  • S. M. Sohel MahmudEmail author
  • Luis Ferreira
  • Md. Shamsul Hoque
  • Ahmad Tavassoli
Original Contribution


This paper deals with the speed choice behaviour of driver on a two-lane bidirectional highway in a heterogeneous traffic environment of a developing country. The major contribution of the paper is the identification and quantification of significant attributes influencing speed choice of a driver at micro-level of the road under study. The latter explored the use of ordinary least square (OLS) and random parameter (RPM) regression models as an alternative methodological approach to relate factors such as road geometry, roadside environment, traffic mix and operational characteristics with driver speed choice at the small segmental level. The comparison of the empirical results shows the RPM model outperforms its fixed parameter-based OLS counterpart. The approach justifies the need to take into account the potential heterogeneity in the impact of factors at the micro-level speed choice behaviour analysis. The analysis used data collected from a section of a major national highway in Bangladesh. Speed data extracted second-by-second was analysed for a range of short road segments. The critical segment length, from the point of view of speed analysis, was identified using different statistical tests. The paper details the data collection method used, as well as the speed-related statistics analysis performed. The results obtained could be used to better understand the speed choice factors of drivers. The findings could also be used to inform policy decisions for managing the appropriate homogeneity of speed among the motorized vehicles of two-lane highways in developing countries, a prerequisite for ensuring safe movement of road users.


Speed behaviour Speed choice Affecting factors Regression model Random parameter Heterogeneous traffic 



The authors would like to thank the Graduate School and the School of Civil Engineering Transport Group at the University of Queensland for their support during the data collection from Bangladesh.

Author’s Contribution

The authors confirm contribution to the paper as follows: study conception and design: First and Second Author; data collection: First and Third Author; analysis and interpretation of results: First Author; draft manuscript preparation: First author; last three authors also supervised the overall research; all authors reviewed the results, manuscript and approved the final version of the manuscript.


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Copyright information

© The Institution of Engineers (India) 2019

Authors and Affiliations

  1. 1.School of Civil EngineeringThe University of Queensland (UQ)BrisbaneAustralia
  2. 2.Department of Civil EngineeringBangladesh University of Engineering and Technology (BUET)DhakaBangladesh

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