A Study on Variations of Car-following Behavior at Sag Sections and the Impact of Introducing ACC System

A sag section is a road segment on an expressway in which the vertical slope increases at a small but constant rate. Sag sections are the main traffic bottlenecks on Japanese expressways. Variations in individual car-following behavior are generally recognized as the key cause of traffic breakdown. This research was conducted to develop a quantitative description of variations in individual car-following behavior by obtaining car-following model parameter values from actual trajectories. A simple and reliable model calibration framework considering the effect of sag section is presented. Analysis of the parameter values obtained showed that 48.87% of drivers are affected by the vertical slope change. The parameter values were found to be concentrated in certain ranges rather than being evenly distributed. The dynamic performance of car-following behavior was also analyzed. The results were compared with the results of experiments conducted with a commercial Adaptive Cruise Control (ACC) system. Of the drivers in the analyzed trajectories, 28.83% were found to outperform the commercial ACC system in preventing perturbation in the leading vehicle's motion from being amplified in the vehicle platoon. The distribution of the parameter values for these drivers was analyzed to identify potential improvements to the ACC system.


  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: pp 256-261
  • Monograph Title: 18th International IEEE Conference on Intelligent Transportation Systems (ITSC 2015)

Subject/Index Terms

Filing Info

  • Accession Number: 01604639
  • Record Type: Publication
  • ISBN: 9781467365956
  • Files: TRIS
  • Created Date: May 2 2016 3:27PM