Heavy Commercial Vehicles-Following Behavior and Interactions with Different Vehicle Classes

This article reports on a study of the following behavior of heavy commercial vehicles and the subsequent impact on the capacity and overall performance of congested freeway sections. The authors compare the following behaviors of heavy commercial vehicles to that of passenger cars. The authors note that the impact of the different vehicle types is not uniform, creating potential problems in freeway operations and safety, particularly is situations of high demand and a high proportion of heavy vehicles. The authors use extensive data collected over a long stretch of freeway using videotaping and surveys at several sites. The authors first study the interaction between heavy vehicles and passenger cars, then implement a trajectory analysis to evaluate the following behaviors of 120 heavy vehicles. Three classes of interactions were analyzed separately, based on headway values and their distributions: car-following-car, car-following-truck, and truck-following-car. The results showed that passenger cars travel further behind heavy vehicles, in both time and space, than they do when following other passenger cars. Heavy vehicles also adopt longer time and distance headways when following other vehicles, however, heavy vehicles travel closer to passenger cars than the reverse.


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  • Accession Number: 01504613
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 24 2014 2:30PM