Simulation Program for Signalized Intersection

by James E. Clark, (A.M.ASCE), Highway Engr.; Office of Planning and Research, Federal Highway Administration, Sacramento, Calif.,

Serial Information: Journal of the Technical Councils of ASCE, 1979, Vol. 105, Issue 1, Pg. 163-175

Document Type: Journal Paper


The development of a computer simulation model to approximate the interactions of those traffic elements present at a signalized intersection is presented. The simulation model is designed as a tool for the engineer or analyst to predict the behavior of a signalized intersection under different operational conditions. GASP IV is the simulation language used in this study. This language is FORTRAN based and can be easily implemented on the computing systems of different manufacturers. By varying different parameters (logo, geometrics, movement percentages, traffic signal information, volumes, phasing, etc.) while holding others constant, the impact of design changes were studied. Both exclusive and no exclusive left-turn phase signal operation were investigated and the simulation output indicates reasonable results. The engineer could use this simulation model in the integral part of making traffic operation decisions.

Subject Headings: Traffic models | Computer models | Simulation models | Traffic signals | Intersections | Decision support systems | Parameters (statistics) | Geometrics

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