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.
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|Item Type:||Conference Paper|
|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.|
|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|
|Last Modified:||29 Feb 2012 23:04|
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