Signalised Intersection Capacity Reduction of Trucks

Ramsay, Euan D., Bunker, Jonathan M., & Troutbeck, Rodney J. (2004) Signalised Intersection Capacity Reduction of Trucks. In Mao, Baohua, Tian, Zongzhong, & Sun, Quanxin (Eds.) Fourth International Conference on Traffic and Transportation Studies, 2-4 August 2004, Dalian, China.


The lower acceleration capability of a heavy vehicle (HV) compared to that of a passenger car results in greater headways for the HV and vehicles behind it departing a queue at an intersection approach. The Highway Capacity Manual would associate this with increased start loss if the HV were located in the first four vehicles in a queue of vehicles, or with reduced saturation flow if located in the fifth or greater queue position. However, in determining saturation flow rate without conducting a survey, HVs are accounted for through the use of a passenger-car equivalency factor to reduce saturation flow – no provision is available to adjust start loss or end gain with HVs. A simple microsimulation model was developed to demonstrate the effects of HVs at different queue positions at a signalised intersection approach. Control delay was found to be greatest with the HV at the front of the queue, decreasing to that of the non-HV case as the HV was moved rearwards. Knowing the probability distribution of HVs amongst queue positions, an average control delay could be determined. Additional traffic-related effects of HVs are discussed, such as disproportionate lane utilisation behind and beside HVs.

Impact and interest:

3 citations in Scopus
Search Google Scholar™

Citation counts are sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

Full-text downloads:

1,476 since deposited on 16 Aug 2004
19 in the past twelve months

Full-text downloads displays the total number of times this work’s files (e.g., a PDF) have been downloaded from QUT ePrints as well as the number of downloads in the previous 365 days. The count includes downloads for all files if a work has more than one.

ID Code: 353
Item Type: Conference Paper
Refereed: Yes
Additional Information: This paper was developed as part of a project sponsored by Queensland Department of Main Roads (DMR) and jointly funded with the Australian Research Council. Contributions to the project by DMR and particularly members of the project reference group are gratefully acknowledged.
Additional URLs:
Keywords: truck, heavy vehicle, signalised intersection, delay, capacity, start loss, saturation flow, end gain, trajectory diagram
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Transport Engineering (090507)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2004 (please consult author)
Deposited On: 16 Aug 2004 00:00
Last Modified: 29 Feb 2012 13:04

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page