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Promet - Traffic&Transportation journal

Accelerating Discoveries in Traffic Science

Accelerating Discoveries in Traffic Science

PUBLISHED
27.06.2017
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Copyright (c) 2024 Li Li, Qing-Chang Lu, Yun-Tao Chang, Zhong-Ren Peng

A Compositional Analysis of Unbalanced Usages of Multiple Left-turn Lanes

Authors:Li Li, Qing-Chang Lu, Yun-Tao Chang, Zhong-Ren Peng

Abstract

Lane usage measures distribution of a specific traffic movement across multiple available lanes in a given time. Unbalanced lane usages decrease the capacity of subject segment. This paper took multiple left-turn lanes at signalized intersections as case study, and explored the influences of some factors on the lane usage balance. Lane usages were calculated from field collected lane volumes and the constant-sum constraint among them was explicitly considered in the statistical analysis. Classical and compositional analysis of variance was respectively conducted to identify significant influential factors. By comparing the results of compositional analysis and those of the classical one, the former ones have better interpretability. It was found that left-turn lane usages could be affected by parameter variance of geometric design or traffic control, such as length of turning curve, length of upstream segment, length of signal phase or cycle. These factors could make the lane usages achieve relative balance at different factor levels.

Keywords:lane usage, drivers’ lane preferences, double and triple left-turn lanes, classical analysis of variance, compositional analysis of variance,

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