00781430

Component

https://doi.org/10.3141/1685-08

http://scholar.google.com...atel&publication_year=1999

Regionwide travel forecasts in small urban areas require good knowledge of through-trip tables for each of several vehicle classes. Survey data are often unavailable or incomplete, so planners would benefit from a means of estimating through-trips from readily available information. A model for through-trip table from trip-distribution theory and elementary geographical principles is postulated and tested. The model considers the level of through-traffic at external stations, the shape of urban areas, and the necessity that trips between any two external points pass through the region because of barriers that impede travel. Separate model variations are developed for a region of arbitrary shape and for a region of circular shape. To ascertain the validity of the approximations, the model is applied to two cities: Oshkosh, Wisconsin, and Tallahassee, Florida. The model for circular-shaped urban areas has produced excellent results for both cities, each of which previously had prepared external-to-external trip tables by sampling actual traffic. Oshkosh's geography is particularly interesting because of two large neighboring lakes that constitute barriers to travel. The model explains almost 96% of the variation in the trip table in Oshkosh and almost 100% of the variation in Tallahassee. These values exceed goodness-of-fit measures that are reported for other models that are described in the literature. Errors in through-trip flows on individual links that potentially serve through-trips are estimated at only about 10% in Oshkosh and 14% in Tallahassee.

This paper appears in Transportation Research Record No. 1685, Transportation Planning, Programming, Public Participation, and Land Use.

English

p. 57-64

1999

Transportation Research Record

0309071119

Figures (4) ; References (5) ; Tables (1)

Forecasting; Mathematical models; Through traffic; Travel; Trip tables; Urban areas

Oshkosh (Wisconsin); Tallahassee (Florida)

Highways; Planning and Forecasting; I72: Traffic and Transport Planning

TRIS, TRB, ATRI

Jan 3 2000 12:00AM

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