Truck Size and Weight Limits Research Plan Committee: First Report: Candidate Research Topics; Framework for Setting Priorities (2018) / Chapter Skim
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4. CANDIDATE RESEARCH PROBLEM STATEMENT TOPICS
4. CANDIDATE RESEARCH PROBLEM STATEMENT TOPICS
Pages 16-25
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CANDIDATE RESEARCH PROBLEM STATEMENT TOPICS The elements of the committee's research roadmap will be problem statements specifying the research necessary for improving projections of the impact of changing size and weight limits. The committee has compiled the lists of candidate research problem statement topics in this section from various sources, including the experience and recommendations of past USDOT truck size and weight studies and research recommendations of past TRB committees.
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due to changes in truck size and weight limits, taking into account limited data availability and variability in local highway agencies' construction and maintenance practices.
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=========================================================================== Safety Research The candidate safety research problem statement topics are organized in two parts: targeted comparative evaluations of the safety performance of truck configurations (see Box 8) and long-term monitoring programs (see Box 9)
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The methods would meet the requirements of the study designs developed in the research outlined in Problem Statement 1, and would be applicable to the targeted comparative evaluations described in Problem Statements 4, 5, and 6. The research would test methods for obtaining weight data, which may include use of weigh-inmotion data and trucking company dispatch records.
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8. Establish protocols for the use of simulation modeling and test track evaluations to estimate safety performance of specific truck configurations Indirect methods, such as simulation modeling and test track evaluations, constitute the only feasible methods to anticipate the safety performance of truck configurations that are not in legal operation in any state.
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6. Implement monitoring and conduct comparative evaluations of the safety performance of truck configurations using large-scale monitoring data This research will implement the monitoring systems demonstrated in the research in Problem Statements 2–5 and use the data to execute the study designs developed in Problem Statement 1.
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The 2002 TRB committee that reviewed past truck size and weight studies concluded that monitoring of compliance with weight regulations is too unsystematic to allow the costs of noncompliance to be estimated (TRB 2002, 5)
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=========================================================================== Mode Choice and Freight Market Research Estimates of the aggregate impacts of changing truck size and weight limits depend on underlying projections of how shippers and carriers would respond to the new regulations. Safety impacts will depend on the change in the volume and distribution of truck traffic, as well as on the relative safety performance of new truck configurations.
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Changes in truck size and weight limits that reduce truck transportation costs may affect truck traffic volume by influencing shippers' decisions regarding shipment size and frequency, location of production and distribution facilities, sources of production inputs, and market destinations of products. Some of these effects will be apparent only after several years.
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Develop methods for incorporating common features of regulatory schemes in evaluations of costs and benefits of changing truck size and weight limits. These features include road network restrictions, permissive versus preemptive federal regulations, permit requirements for vehicles exceeding certain limits, performance standards for vehicle stability and control, user fees related to infrastructure costs imposed by specific truck operations, and grandfather and/or other special exemptions from limits.
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