Modelling follow up time at a single-lane roundabout

Xiaobo Qu, Jin Zhang, Shuaian Wang, Zhiyuan Liu

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16 Citations (Scopus)


The follow up time is an important parameter for estimating the entry capacity of roundabouts. However, its variability and contributing factors have long been ignored in the literatures. In this study, 171 follow up samples and contributing factors (traffic volume, vehicle position, waiting vehicles behind, vehicle type, and drivers’ gender) are collected at a roundabout in Pacific Pines, Australia. It is found that the follow up time is indeed significantly affected by traffic volume, waiting vehicles behind, vehicle type, and drivers’ gender. In order to establish the relationship between the follow up time and its contributing factors, an inverse Gaussian regression model is further developed. This relationship could be applied to estimate the entry capacities by taking into account the variability of follow up samples. According to the model, the traffic volume and vehicle types are the most important contributing factors.

Original languageEnglish
Pages (from-to)97-102
Number of pages6
JournalJournal of Traffic and Transportation Engineering (English Edition)
Issue number2
Publication statusPublished - 1 Apr 2014


  • critical gap
  • follow up time
  • roundabout capacity
  • Modelling follow up time at a single-lane roundabout

    Qu, X., Wang, S. & Liu, Z., 2014, CICTP 2014: Safe, Smart, and Sustainable Multimodal Transportation Systems: Proceedings of the 14th COTA International Conference of Transportation Professionals. Ma, J., Yin, Y., Huang, H. & Pan, D. (eds.). Reston VA USA: American Society of Civil Engineers, p. 2002 - 2011 10 p.

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