Time Headway Analysis for Four-Lane and Two-Lane Roads

Original Article


Study of vehicle time headways has been a subject to many aspects of traffic flow studies because time headway between any two successive vehicles is considered as an important parameter affecting capacity, safety, delay, driver behavior and level of service of a transportation system. Although a large number of studies exist in the field of time headway modelling, there is still a paucity of research related to time headway distribution study in two-lane bidirectional roads and four-lane divided roads with respect to varying flow rate levels. The present paper intends to study the variations in time headway distributions for four flow levels (0–600, 600–1200, 1200–1800 and 1800–2400 PCU/h) for different two-lane and four-lane roads in Assam, with traffic data collected from video-recorders. It is further aimed to investigate the differences in headway maintaining behavior of vehicles in morning hours and in evening hours (in presence of headlights) when the flow rates for the analyzed periods are comparable. Also vehicle-type specific headway analysis is conducted for two-lane bidirectional roads. The result of this paper not only identifies the difference in time headway distributions of mixed vehicular flow for different flow levels but also captures the differences in vehicle-type specific headways and headway maintaining behavior of vehicles when the headlights of vehicles are turned on. Results of the study can be used as an input in practical applications, especially for developing micro-simulation models and also can be used in capacity estimation, safety analysis, etc.


Time headway Heterogeneous traffic Vehicle-pair Visibility Headway distribution 



The authors acknowledge the opportunity to present the research work that forms the basis of this article at the 14th World Conference on Transport Research held at Shanghai, China from 10 to 15 July 2016. The data collection under this research work was funded by CSIR-Central Road Research Institute (CRRI), New Delhi under the Supra Institutional Network Project (SINP) category as part of the 12th Five Year Plan Period (FYP).


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Copyright information

© Springer International Publishing Switzerland 2017

Authors and Affiliations

  1. 1.Department of Civil EngineeringIndian Institute of Technology GuwahatiAssamIndia

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