Evaluating Reliability of TRANSYT-7F Optimization Schemes
Publication: Journal of Transportation Engineering
Volume 127, Issue 4
Abstract
This paper investigates the reliability of TRANSYT-7F optimal solutions from two perspectives: (1) the effect of the selected optimization criterion on the values of various system performance measures; and (2) the extent to which TRANSYT-7F signal plans remain optimal when evaluated in a microscopic and stochastic traffic environment. The well-established CORSIM model was used for the latter test. A customized code has been developed that can automatically generate statistical distributions of selected performance measures in CORSIM based on various TRANSYT-7F optimization runs. The method has been applied to a calibrated test network in Chicago consisting of 9 signalized intersections with 50 nodes and 74 links. It was found that while good correlation existed between the corresponding performance measures in TRANSYT-7F and CORSIM under light traffic, their correlation diminished under congested flow. In particular, the best signal strategy identified in TRANSYT-7F was not the best in the CORSIM environment. The discrepancies are undoubtedly due to the basic difference between the two models: TRANSYT-7F is deterministic, CORSIM is stochastic.
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References
1.
Federal Highway Administration FHwA. ( 1997). CORSIM user's manual, U.S. Department of Transportation, Ofc. of Safety and Traffic Operation R&D, Intelligent Sys. and Technol. Div. McLean, Va.
2.
Efron, B., and Tibshirani, R. J. ( 1993). An introduction to the bootstrap, Chapman & Hall, New York.
3.
Leonard, J. D., II, and Rodegerdts, L. A. (1998). “Comparison of alternative signal timing policies.”J. Transp. Engrg., ASCE, 124(6), 510–520.
4.
Li, M., and Gan, A. C. ( 1999). “Signal timing optimization for oversaturated networks using TRANSYT-7F, Transp. Res. Rec. 1683, Transportation Research Board, Washington, D.C., 118–126.
5.
Little, J. D. C., and Kelson, M. D. ( 1980). “Optimal signal timing for arterial signal systems, MAXBAND.” Summary Rep. 1. Operations Res. Ctr., Massachusetts Institute Technology, Cambridge, Mass.
6.
Messer, C. J., Haenel, H. E., and Koeppe, E. A. ( 1974). “A report on the user's manual for progression analysis and signal system evaluation routine—PASSER II.” TTI Res. Rep. 165-14, Texas Transportation Institute College Station, Tex.
7.
Park, B., Messer, C. J., and Urbanik, T., II. ( 1999a). “Initial evaluations of new TRANSYT-7F version 8.1 program.” Transp. Res. Rec. 1683, Transportation Research Board, Washington, D.C., 127–132.
8.
Park, B., Messer, C. J., and Urbanik, T., II. ( 1999b). “Traffic signal optimization program for oversaturated conditions: A genetic algorithm approach.” Transp. Res. Rec. 1683, Transportation Research Board, Washington, D.C., 133–142.
9.
Park, B. ( 1998). “Development of genetic algorithm based signal optimization program for oversaturated intersections.” PhD dissertation, Dept. of Civ. Engrg., Texas A&M University, College Station, Tex.
10.
Quercus Systems. ( 1996). Personal REXX user's guide, Calif.
11.
Robertson, D. I. ( 1969). “TRANSYT: A traffic networks study tool.” Road Res. Lab. Rep. 253, Road Research Laboratory, Crowthorne, U.K.
12.
Wallace, C. E., Courage, K. G., Hadi, M. A., and Gan, A. C. ( 1998). TRANSYT-7F user's guide, Transp. Res. Ctr., University of Florida, Gainesville, Fla.
13.
Webster, F. V. ( 1958). “Traffic signal settings.” Road Res. Tech. Rep. No. 39, Her Majesty's Stationary Office, London.
Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 127 • Issue 4 • August 2001
Pages: 319 - 326
History
Received: Jun 5, 2000
Published online: Aug 1, 2001
Published in print: Aug 2001
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