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AuthorAbuhijleh, Abdelrahman
AuthorDias, Charitha
AuthorAlhajyaseen, Wael
AuthorMuley, Deepti
Available date2020-09-21T06:46:58Z
Publication Date2020-06-01
Publication NameSustainability (Switzerland)
Identifierhttp://dx.doi.org/10.3390/su12114485
CitationAbdelrahman Abuhijleh & Charitha Dias & Wael Alhajyaseen & Deepti Muley, 2020. "Effect of U-Turns and Heavy Vehicles on the Saturation Flow Rates of Left-Turn Lanes at Signalized Intersections," Sustainability, MDPI, Open Access Journal, vol. 12(11), pages 1-14, June.
ISSN2071-1050
URIhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85086108805&origin=inward
URIhttp://hdl.handle.net/10576/16207
Abstract© 2020 by the authors. The Saturation Flow Rate (SFR) is a primary measure that can be used when estimating intersection capacity. Further, the efficiency of signal control parameters also depends on the accuracy of assumed SFR values. Driver behavior, type of movement, vehicle type, intersection layout, and other factors may have a significant impact on the saturation flow rate. Thus, it is expected that driving environments that have heterogeneous driver populationswith different driving habits and culturesmay have different SFRs. In practice, the proposed SFRs based on US standards (Highway Capacity Manual, 2016) have been adopted in the State of Qatar without validation or calibration to consider the local road environment and the characteristics of the driving population. This study aims to empirically analyze the saturation flow rates for exclusive left-turn lanes and shared left-and U-turn lanes at two signalized intersections in Doha city, while considering the effects of heavy vehicles and U-turn maneuvers. Empirical observations revealed that the average base SFR, i.e., when the influences from heavy vehicles and U-turns were excluded, could vary approximately from 1800 vehicles per hour per lane (vphpl) to 2100 vphpl for exclusive left-turning lanes and approximately from 1800 vphpl to 1900 vphpl for shared left-and U-turning lanes. Furthermore, this study proposed different adjustment factors for heavy vehicle and U-turn percentages which can be applied in practice in designing signalized intersections, particularly in the State of Qatar.
Languageen
PublisherMDPI
SubjectExclusive left-turning lanes
Saturation flow rate
Shared lanes
Signalized intersections
U-turns
TitleEffect of U-turns and heavy vehicles on the saturation flow rates of left-turn lanes at signalized intersections
TypeArticle
Pagination1-14
Issue Number11
Volume Number12
dc.accessType Open Access


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