Driver Population Factor in New Highway Capacity Manual
Publication: Journal of Transportation Engineering
Volume 113, Issue 5
Abstract
The 1985 Highway Capacity Manual suggests the use of an adjustment factor called fp to reflect the influence of driver population on the highway capacity analysis for freeways and multilane highways. The manual recommends a value of fp equal to 1.0 for commuter traffic streams or other regular users of a facility and a range of fp between 0.75 and 0.90 for ``other'' types of traffic streams. As a prerequisite to an appropriate application of the factor fp, a systematic and objective method that can be used for classification of highways according to driver population characteristics is described. Using data from two Canadian provinces, seven classes of roads are identified on the basis of trip purpose and trip length distribution. Suggested values of fp are listed that can be used as a ``guide'' in exercising an engineering judgment in selecting a specific fp value for a particular type of traffic stream.
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References
1.
Bureau of Public Roads. (1950). Highway capacity manual. Washington, D.C.
2.
Highway Research Board. (1965). Highway capacity manual. Special Report 87, Washington, D.C.
3.
Sharma, S. C. (1983). “Improved classification of Canadian primary highways according to type of road use.” Canadian J. Civil Engrg., 10(3), 497–509.
4.
Sharma, S. C., and Werner, A. (1981). “Improved method of grouping provincewide permanent traffic counters.” Transport. Res. Rec. 815, Transport. Res. Board, Washington, D.C., 12–18.
5.
Transportation Research Board. (1985). Highway capacity manual. Special Report 209, Washington, D.C.
6.
Wyatt, J., and Sharma, S. C. (1986). “Classification of Saskatchewan highways according to type of road use: Testing of a model.” Canadian J. Civil Engrg., 13(1), 53–58.
Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 113 • Issue 5 • September 1987
Pages: 575 - 579
Copyright
Copyright © 1987 ASCE.
History
Published online: Sep 1, 1987
Published in print: Sep 1987
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