00620540

Component

http://onlinepubs.trb.org...trr/1991/1313/1313-002.pdf

https://scholar.google.co...Thom&publication_year=1991

Weight limits are a principal determinant of the weight characteristics of large trucks. They provide a logical and practical base from which these weight characteristics can be predicted. Such predictions are necessary for evaluating the relative benefits and costs of alternative weight and dimension policies. During the past 20 years, Canada has had a weight limit policy that has stipulated a variety of different weight limit regimes to the same truck type. This has provided an on-road experiment of how weight limits translate into actual truck weights. This experiment has created a large and unique data set that permits relating actual truck weights to governing weight limits spanning a broad range. On the basis of this data set, empirical models linking the distribution of gross vehicle weights (GVWs) of three of Canada's most common large truck combinations to the GVW limit governing these trucks are developed. They assume an idealized complete compliance condition, with no violation of the limit. The three truck types for which models are developed are the 5-axle (3-S2) tractor-semitrailer, the 7-axle (3-S2-S2) B-train combination, and the 7-axle (3-S2-2) A-train combination. The complete compliance condition is of course violated if weight limits are not enforced or overweight operations are allowed by special permit. The predictive capability of the 3-S2 model is examined in relation to the GVW distribution of a sample of 3-S2s operating under a GVW limit different from those used in constructing the model. The predicted and actual distributions compare favorably.

This paper appears in Transportation Research Record No. 1313, Freight Transportation: Truck, Rail, Water, and Hazardous Materials 1991. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01407143

p. 11-19

1991

Transportation Research Record

030905124X

Figures (9) ; References (15) ; Tables (4)

Alternatives analysis; Empirical methods; Field studies; Forecasting; Gross vehicle weight; Laws; Mathematical models; Regulation; Size; Size and weight regulations; Tractor trailer combinations; Trucks; Trucks by weight; Vehicle weight; Weight

Longer combination vehicles; Weight distribution

Canada

Canada

Highways; Law; Motor Carriers; Planning and Forecasting; I72: Traffic and Transport Planning

TRIS, TRB, ATRI

Mar 31 1992 12:00AM

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