United States Department of Transportation
i
Generic Vehicle Speed Models Based On Traffic Simulation: Development and Application (Revision #1)
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1994-12-15
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[PDF-1.57 MB]
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Abstract:The findings of a research project to develop new methods of estimating speeds for inclusion in the Highway Performance Monitoring System (HPMS) Analytical Process are summarized. The paper focuses on the effects of traffic conditions excluding incidents (recurring congestion) on daily average speed and excess fuel consumption. A review of literature revealed that most techniques used to estimate speed as a function of congestion failed to address the effects of queuing. The methodology presented used the FRESIM and NETSIM microscopic traffic stimulation models to develop uncongested speed functions and as a calibration base for the congested flow functions. The chief contributions of the new speed models are the simplicity of application and their explicit accounting for the effects of queuing. Specific enhancements include: (1) the inclusion of a queue discharge rates for freeways; (2) use of newly defined uncongested flow speed functions; (3) use of generic temporal distributions that account for peak spreading; and (4) a final model form that allows incorporation of other factors that influence speed, such as grades and curves. The main limitation of the new speed models is the fact they are based on simulation results and not on field observations. It is recommended that these and all future speed models be validated against field data. Prepared for presentation at the 74th Annual Meeting of the Transportation Research Board. 3 Tables, 6 figures, references. 1,602k, 28p.
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