Initial Evaluations of New TRANSYT-7F Version 8.1 Program

Abstract

Recently released TRANSYT-7F version 8.1 was found to provide significant feature improvements such as multiple-cycle simulation, spillback effects, and optimization for oversaturated conditions. An overview of these new features compared with features of the previous version is presented. A comparison between the new TRANSYT-7F version 8.1 and the previous version 7.2 for oversaturated, closely spaced intersections is based on CORSIM simulations. The comparison results show that the new TRANSYT-7F program outperforms the previous one in terms of average delay, queue time, and throughput for oversaturated conditions, but results for undersaturated conditions were similar. The results indicate the queue-blocking algorithm and multiple-cycle simulation recently added to TRANSYT-7F are essential for traffic signal optimization during oversaturated conditions.

Get full access to this article

View all access options for this article.

References

Johnson

B. A.

, and Akcelik

. Review of Analytical Software for Applicability to Paired Intersections. Proceedings of Australian Road Research Board, Vol. 16, Part 5, Vermont South, Victoria, 1992, pp. 347–367.

Wallace

C. E.

, Courage

K. G.

, Hadi

M. A.

, and Gan

A. C.

. TRANSYT-7F User’s Guide. Transportation Research Center, University of Florida, Gainesville, March 1998.

Robertson

D. I.

TRANSYT: A Traffic Network Study Tool. Road Research Laboratory Report 253. Crowthorne, Berkshire, Great Britain, 1969.

Gartner

, Little

J. D. C.

, and Gabbay

. Optimization of Traffic Signal Setting in Networks by Mixed Integer Linear Programming: The MITROP Computer Program. Technical Report 91. Operations Research Center, Massachusetts Institute of Technology, Cambridge, March 1974.

Rouphail

N. M.

Analysis of TRANSYT Platoon-Dispersion Algorithm. In Transportation Research Record 905, TRB, National Research Council, Washington, D.C., 1983, pp. 72–80.

Cohen

S. L.

, and Mekemson

J. R.

. Optimization of Left-Turn Phase Sequence on Signalized Arterials. In Transportation Research Record 1021, TRB, National Research Council, Washington, D.C., 1985, pp. 53–58.

Park

Development of Genetic Algorithm-Based Signal Optimization Program for Oversaturated Intersections. Ph.D. dissertation. Texas A&M University, College Station, Aug. 1998.

CORSIM User’s Manual. Version 1.03. FHWA, U.S. Department of Transportation, April 1997.

Messer

C. J.

, and Bonneson

J. A.

. NCHRP Web Document 12: Capacity Analysis of Interchange Ramp Terminals. TRB, National Research Council, Washington, D.C., April 1997, 355 pp.

10.

Messer

C. J.

Simulation Studies of Traffic Operations at Oversaturated, Closely Spaced Signalized Intersections. In Transportation Research Record 1646, TRB, National Research Council, Washington, D.C., 1998, pp. 115–123.

11.

Park

, Messer

C. J.

, and Urbanik II . A Genetic Algorithm-Based Signal Optimization Program for Oversaturated Intersections. Paper accepted for presentation at the 5th World Congress on Intelligent Transport Systems, Korea Exhibition Center, Seoul, Korea, Oct. 12–16, 1998.