01099259

Component

https://doi.org/10.3141/2071-09

http://scholar.google.com...Tong&publication_year=2008

A left-turn bay that does not have a sufficient length would be blocked by the adjacent through traffic. Left-turn vehicles can also spill back to block the through traffic when the left-turn demand is high. These two types of left-turn-related blockages have adverse effects on the operation of a signalized intersection. Left-turn bay blockage by through traffic will reduce the left-turn capacity, and left-turn bay spillback will affect the adjacent through capacity. Both problems are uncharted in the "Highway Capacity Manual" (HCM). This research studies these two blockage scenarios associated with left-turn bays under different left-turn signal operations. The capacity of the left-turn and through movements is modeled as a function of the length of the left-turn bay by using a probabilistic approach, taking into account potential blockage due to a short left-turn bay length. The developed capacity model will be validated on the basis of CORSIM simulations of a real-world signalized intersection. The research is aimed at estimating the left-turn and adjacent through capacity when left-turn bay blockage or spillback occurs, to complement the HCM method and highlighting the effect of the length of the left-turn bay and the left-turn signal strategy.

01118256

English

pp 71-76

2008

Transportation Research Record: Journal of the Transportation Research Board

9780309113465

Print

Figures (4) ; Photos (2) ; References (11)

Highway capacity; Highway traffic control; Left turn lanes; Left turn phase; Length; Signalized intersections; Through traffic; Traffic models; Validation

CORSIM (Traffic simulation model); Highway Capacity Manual

Lane blocking; Spillback effects (Traffic)

Highways; Operations and Traffic Management; I73: Traffic Control

TRIS, TRB, ATRI

Jan 29 2008 4:01PM

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