Target Completion Date: February 10, 2011 Safety, Operations, and Traffic Engineering
Many vehicle crashes that occur at high-speed signalized intersections are associated with dilemma zones, defined as areas where some drivers may decide to proceed through an intersection while others may decide to stop at the onset of a yellow indication. Incorrect driver decisions can lead to either rear-end crashes if drivers decide to stop when they should have proceeded or right-angle crashes with side-street traffic when drivers proceed when they should have stopped. Current dilemma zone mitigation systems assume that the driver dilemma zone is fixed, with a corresponding fixed perception-reaction time (PRT). It is not clear how PRTs and corresponding dilemma zones vary as a function of driver characteristics and surrounding traffic conditions. Therefore, the objective of this research is to characterize driver behavior within the dilemma zone and develop models that can be implemented within traffic signal control systems.
Last updated: July 5, 2023
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