On-Line Measure of Shockwaves for ITS Applications
Publication: Journal of Transportation Engineering
Volume 129, Issue 1
Abstract
The formation of shockwaves demarking boundaries between different flow states in time-space domains has been well studied and documented in the literature. Previous research concentrated on theoretical and mathematical analyses of shockwaves, providing valuable insights into shockwave phenomena. In the past few years, the traffic signal systems community has witnessed an increasing interest in adaptive control algorithms. These algorithms strive to achieve real-time platoon accommodation by assuming platoon speed and dispersion characteristics in order to predict its time of arrival at the downstream signal. Instead of assuming platoon speed and dispersion characteristics, we propose an on-line analysis of shockwaves at the downstream intersection to achieve the same purpose. This paper introduces a new metric that can detect and quantify shockwaves formed as a result of a suboptimal offset at an intersection. The new metric, the model, captures the effects of shockwaves using cycle-based tabulation of advance detector occupancy and count. A discriminant analysis is conducted to develop thresholds to which values can be compared to estimate the offset performance. The metric introduced in this paper can be used for implementing adaptive offset tuning algorithms in a traditional closed loop coordinated traffic signal system.
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References
Abbas, M. M. (2001). “A real-time offset transitioning algorithm for coordinating traffic signals.” PhD thesis, Purdue Univ., West Lafayette, Ind.
Abbas, M., Bullock, D., and Head, L. (2001). “A real time offset transitioning algorithm for coordinating traffic signals.” Transportation Research Record No. 1748, Transport Research Council, Washington, D.C., 26–39.
Husch, D. (1998). Synchro 3.2 user guide, Trafficware, Berkeley, Calif.
Kaman Sciences Corp. (1997). CORSIM user’s manual, version 1.03, Kaman Sciences Corp., Colorado Springs, Colo.
Lighthill, M. J., and Whitham, G. B. (1955). “On kinematic waves. II. A theory of traffic flow on long crowded roads.” Proc., R. Soc. London, Ser. A, 229(1178), 317–345.
May, A. D. (1990). Traffic flow fundamentals, Prentice-Hall, Englewood Cliffs, N.J.
SAS/STAT user’s guide, Version 6. (1990). 4th Ed., SAS Institute Inc., Cary, N.C.
Shoup, G., and Bullock, D. (1999). “A dynamic offset tuning procedure using real-time travel data.” Transportation Research Record No. 1683, National Research Council, Washington, D.C., 84–94.
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Copyright © 2003 American Society of Civil Engineers.
History
Received: May 24, 2001
Accepted: Mar 25, 2002
Published online: Dec 13, 2002
Published in print: Jan 2003
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