01476120

Component

https://doi.org/10.3141/2395-12

http://scholar.google.com...onis&publication_year=2013

Freeway analysis procedures in the widely used Highway Capacity Manual (HCM) include the input of a driver population factor (Fp), which allows the analyst to adjust the demand depending on the familiarity of drivers with the roadway. This adjustment is based on the assumption that unfamiliar drivers will drive at slower speeds with longer headways and that higher capacity would therefore be required. However, little research supports the use of the Fp, and the HCM cautions against the use of Fp unless the analyst is fairly certain the traffic stream is actually unfamiliar with the roadway. As an experiment, three bottlenecks in California were selected and analyzed during the weekday peaks and weekend afternoons in periods during which the traffic stream was likely to be nonlocal. The results showed that the changes in flow were minor at all three locations. Further research with additional sites and an increased awareness of the definition of familiarity will be required to confirm the results from this research.

01517906

13-4349

English

pp 103–110

2013

Transportation Research Record: Journal of the Transportation Research Board

9780309287180

Print

Figures (6) ; References (9) ; Tables (4)

Bottlenecks; Drivers; Freeways; Highway capacity; Traffic congestion

Interstate 80

Driver familiarity; Driver population factor

California

Highways; Operations and Traffic Management; Planning and Forecasting; I72: Traffic and Transport Planning; I73: Traffic Control

TRIS, TRB, ATRI

Feb 5 2013 12:50PM

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• Toward a Capacity Analysis Procedure for Nonstandard Two-Way Stop-Controlled Intersections
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