Abstract
The Highway Capacity Manual is a publication widely used throughout the world as a guide to highway capacity and level of service analysis. The third and the latest edition of the Manual, a 1985 publication of the United States Transportation Research Board, has introduced, among many other changes, an adjustment factor called fp to reflect the influence of driver population on the highway capacity analysis for freeways and multilane highways. This note reviews and elaborates on the driver population factor. As a prerequisite to an appropriate application of the factor fp, this note refers to a systematic and objective method that can be used for classification of highways according to driver population characteristics. By taking an example of the road classes in Alberta, the note suggests a set of fp values that can be used as a guide to exercise an engineering judgement in selecting a specific fp value for a particular type of traffic stream. Also included in this note is a brief economic analysis carried out with an objective of determining the importance and sensitivity of the factor fp in transportation analysis. Key words: cost–volume curves, driver population factor, economic analysis, highway capacity, road classification, traffic stream characteristics.
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