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A Model and Its Applications for Predicting Passing Rate at Passing Zones on Two-Lane Rural Highways
KTH, School of Architecture and the Built Environment (ABE), Transport Science. Northeastern University, USA.
2016 (English)In: Journal of transportation engineering, ISSN 0733-947X, E-ISSN 1943-5436, Vol. 142, no 3, UNSP 04015049Article in journal (Refereed) PublishedText
Abstract [en]

Passing zones are designed to provide sufficient sight distance for fast vehicles to pass safely slow vehicles and contribute to operational efficiency of two-lane highways. However, lack of suitable models to predict passing rate and capacity has made it difficult to quantify operational benefits of passing zones. In this paper, a model is proposed to predict passing rate in the subject direction at passing zones using traffic and geometric factors. The model is developed based on speed and passing data collected at 19 passing zones in Uganda using pneumatic tube classifiers and video recordings. Findings show that passing rates depend on the length of the passing zone, absolute vertical grade, traffic volume in two travel directions, directional split, 85th percentile speed of free-flow vehicles and percent heavy vehicles in the subject direction. The peak passing rate also referred to as the passing capacity occurs at 200, 220, and 240 vehicles/h in the subject direction for 50/50, 55/45, and 60/40 directional splits, respectively. The model could potentially be applicable in planning, design, and safety evaluation of two-lane rural highways.

Place, publisher, year, edition, pages
American Society of Civil Engineers (ASCE), 2016. Vol. 142, no 3, UNSP 04015049
Keyword [en]
Passing rate, Passing capacity, Passing zones, Negative binomial regression, Two-lane highways
National Category
Transport Systems and Logistics
Identifiers
URN: urn:nbn:se:kth:diva-183613DOI: 10.1061/(ASCE)TE.1943-5436.0000820ISI: 000370421700002ScopusID: 2-s2.0-84958251524OAI: oai:DiVA.org:kth-183613DiVA: diva2:913156
Funder
Sida - Swedish International Development Cooperation Agency
Note

QC 20160319

Available from: 2016-03-19 Created: 2016-03-18 Last updated: 2016-03-19Bibliographically approved

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Koutsopoulos, Haris N.
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