Journal
TRANSPORTATION RESEARCH PART B-METHODOLOGICAL
Volume 41, Issue 10, Pages 1139-1150Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.trb.2007.05.003
Keywords
unsignalized intersections; merge; macroscopic model; delay; dynamic capacity; priority mode; merging opportunity
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The following paper presents a dynamic macroscopic model for unsignalized intersections which accounts for time-limited disruptions in the minor stream flow, even in free-flow conditions when the average flow demand is satisfied. It introduces a deterministic fictive traffic light to represent an average alternating sequence of available and busy time periods for insertion depending on the major stream flow. Two allocation schemes of the total outflow during green periods are developed to model the influence or non-influence of the minor stream over the major stream flow. The aggregation of the resulting dynamic flow variations gives relevant capacity values. Moreover, the model predicts accurate average vehicle delay and queue length estimates compared to theoretical and empirical data. It has three easy-to-measure parameters and can be integrated into a dynamic macroscopic simulation tool for urban networks. (c) 2007 Elsevier Ltd. All rights reserved.
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