Comparison of TRC 212 and SR 209 LOS Calculations

by Martin C. Nizlek, Professional Solutions Inc, Vashon, WA, USA,
Robert M. Shull, Professional Solutions Inc, Vashon, WA, USA,

Document Type: Proceeding Paper

Part of: Microcomputer Applications in Transportation II


With the release in 1985 of Transportation Research Board (TRB) Special Report (SR) 209, numerous traffic engineering agencies began the transition to new methods of calculating capacity and levels of service of street segments and intersections. Many agencies have been familiar with the methodology and results of Transportation Research Circular 212. However, SR 209, the 1985 Highway Capacity Manual, and TRC 212 methods reportedly do not always produce the same results. Further, it has been the authors observations that SR 209 procedures are such that minor variation in certain of the input parameters result in wide variations in the resulting capacity and/or level of service calculations. This paper investigates these differences and variations.

Subject Headings: Comparative studies | Traffic capacity | Traffic signals | Professional societies | Parameters (statistics) | Intersections | Streets | Systems engineering

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