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First published January 2007

Empirical Observations of Dynamic Dilemma Zones at Signalized Intersections

Abstract

The results are presented from an empirical study on the distribution of dilemma zones for different groups of drivers at signalized intersections. With a specially designed video-based system, this study conducted extensive field observations of the responses of 1,123 drivers to a yellow phase at six intersections with high accident frequency, including all critical data such as the speed evolution during the yellow phase, the acceleration and deceleration rates, and the approximate reaction time to an encountered yellow phase. These empirical results revealed that the dilemma zone is dynamic in nature, with its location varying with the driving population, and that the recommended and commonly used practice of extending the yellow phase duration may not eliminate all the dilemma zones. Two types of strategies that can effectively eliminate the dynamic dilemma zones are also designed to improve intersection safety.

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References

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Article first published: January 2007
Issue published: January 2007

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© 2007 National Academy of Sciences.
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Authors

Affiliations

Yue Liu
Department of Civil Engineering, University of Maryland, College Park, MD 20742.
Gang-Len Chang
Department of Civil Engineering, University of Maryland, College Park, MD 20742.
Ruihua Tao
Office of Traffic and Safety, Maryland State Highway Administration, 7491 Connelley Drive, Hanover, MD 21076.
Thomas Hicks
Office of Traffic and Safety, Maryland State Highway Administration, 7491 Connelley Drive, Hanover, MD 21076.
Eric Tabacek
Office of Traffic and Safety, Maryland State Highway Administration, 7491 Connelley Drive, Hanover, MD 21076.

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