Impact of Truck Characteristics on Pavements
Impact of Truck Characteristics on Pavements

Author: Stuart W. Hudson

Publisher:

Published: 1992

Total Pages: 226

ISBN-13:

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Truck load equivalency factors relate vehicle axle loads to pavement damage and life. They provide a method to convert the effects of mixed traffic to a standard loading condition. Equivalent loadings for most pavement design and evaluation procedures are currently predicted using the AASHTO method of equivalency factors. This study was undertaken to evaluate various types of primary pavement response derived load equivalency factors. These use pavement response measurements such as strain and deflection to estimate the equivalent damaging effect of any axle loading condition. These types of factors are also expressed in terms of a relative number of equivalent standard axle loads. A number of primary response equivalency factor methods were evaluated and several selected for further study. Deflection and strain pavement response measurements were evaluated over an experimental factorial of axle type, axle load, tire pressure, speed, pavement thickness, and pavement temperature. Primary response load equivalencies were calculated using the selected methods and a number of statistical comparisons were made.

Truck Weight Limits
Truck Weight Limits

Author: National Research Council (U.S.). Committee for the Truck Weight Study

Publisher: Transportation Research Board

Published: 1990

Total Pages: 322

ISBN-13: 9780309049559

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To help assess proposals for further changes in federal truck weight limits, Congress requested this study through Section 158 of the Surface Transportation and Uniform Relocation Assistance Act of 1987. To conduct the study, the National Research Council convened a special Transportation Research Board committee with experts in pavements, bridges, highway safety, freight transportation economics, motor vehicle design, highway administration, motor carrier operations, and enforcement of motor vehicle regulations. The study focused on four issues identified in the study request that involve potential changes to federal weight limits for Interstate highways: (1) Elimination of existing grandfather provisions; (2) Alternative methods for determining gross vehicle weight and axle loadings; (3) Adequacy of the current federal bridge formula; and (4) Treatment of specialized hauling vehicles--garbage trucks, dump trucks, and other trucks with short wheel bases that have difficulty complying with the current federal bridge formula. For each of these issues, the study committee estimated the nationwide effects of changes in federal limits proposed by the trucking industry, highway agencies, and other groups. Projections of heavy-truck miles by type of truck, region of the country, highway functional class, and operating weight were developed for a base case and alternative truck weight regulatory scenarios. These projections were then used to estimate impacts on truck costs, pavements, bridges, and safety.

Wide-base Truck Tire Effects on Pavement Performance and Vehicle Regulatory Legislation
Wide-base Truck Tire Effects on Pavement Performance and Vehicle Regulatory Legislation

Author: Raymond K. Moore

Publisher:

Published: 1992

Total Pages: 88

ISBN-13:

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Current operating practice in the trucking industry related to tire pressures and truck tires are summarized. Findings of recent (since 1987) pertiment pavement performance research including both full-scale and analytical pavement response and performance studies are discussed. Pertinent findings developed in previous literature reviews are also included. Regulatory approaches developed by the various states based on information from a telephone survey conducted during July and August 1991 are included. Economic analyses are used to compare the increased annualized bituminous pavement rehabilitation costs with trucking industry benefits. Recommendations regarding the regulation of wide-base truck tires are presented.