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Comprehensive Truck Size and Weight Limits Study: Comparison of Results Report

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April 2016

U.S. Department of Transportation Federal Highway Administration logo

Table of Contents

1 Introduction
2 Modal Shift Comparative Analysis
2.1 Purpose
2.2 Comparison of Modal Shift Study Findings
2.3 Comparison of Energy and Environmental Impact Findings
2.4 Comparison of Traffic Operations Impacts from Various Studies
3 Compliance Comparative Analysis
3.1 Purpose
3.2 Comparison of Compliance Analysis Results
3.3 Comparison of Other Results
3.4 References
4 Highway Safety and Truck Crash Comparative Analysis
4.1 Purpose
4.2 Comparison of Safety Study Findings
5 Pavement Comparative Analysis
5.1 Purpose
5.1 Comparison of Pavement Study Findings
6 Bridge Comparative Analysis
6.1 Purpose
6.2 Comparison of Bridge Study Findings
6.2.1 Structural Impacts Due to Overweight Trucks
6.2.2 Bridge Deck Deterioration, Service File and Preventative Maintenance

List of Tables

Table 2-1 Results Compared by Specific TSW Studies
Table 2-2 Comparison of Studies that Have Estimated Fuel Consumption Differences among Vehicle Classes
Table 2-3 Changes in Congestion Delay and Costs Estimated in Three Previous Truck Size and Weight Studies
Table 3-1 Summary of Scenario Results for the Compliance Comparative Analysis
Table 3-2 Comparison of Results
Table 4-1 Synthesis of Previous Studies
Table 5-1 Summary Pavement-Related Analysis Results
Table 6-1 Major Bridge Study Analyses
Table 6-2 2014 CTSW Study Bridge Results
Table 6-3 Major Bridge Study Results
Table 6-4 Highway Cost Allocation Studies (as applied to bridges) (US)
Table 6-5 National (Highway) Cost Allocation Studies (Foreign)

List of Acronyms

Acronym Definition
AASHTO Association of American State Highway and Transportation Officials
CFR Code of Federal Regulations
CTSW Comprehensive Truck Size and Weight Limits Study
FHWA Federal Highway Administration
GVW Gross vehicle weight
LCV longer combination vehicles
LTL Less than truckload
NHTSA National Highway Traffic Safety Administration
OS/OW oversize/overweight
USC United States Code
USDOT US Department of Transportation
VMT vehicle miles traveled
VIUS Vehicle Inventory and Use Survey
WHVC World Harmonized Vehicle Cycle
WIM weigh-in-motion


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