![]() The purpose of this task is to estimate the extent to which changes in Federal truck size and weight limits might cause shifts in how freight is shipped including shifts between modes ( e.g., some traffic shifting from rail to truck) and shifts from one truck configuration to another ( e.g., shifts from configurations that were legal under current truck size and weight limits to configurations that would become legal under new size and weight limits). The literature review will address the NAS four issues for each of the three areas. ![]() This desk scan is organized into three primary sections: 1) modal shift diversion studies, 2) travel fuel consumption studies, and 3) heavy truck impact on highway traffic operations. This desk scan includes a review of key literature related to estimates of modal shifts and related impacts associated with changes in truck size and weight limits as well as more general literature on mode choice. Synthesis of quantitative results of past studies including reasonable ranges of values for impact estimates.Assessment of the current state of understanding of the impacts and needs for future research, data collection and evaluation.Identification of data needs and a critique of available data sources.Survey of analysis methods and a synthesis of the state of the art in modeling impacts. ![]() Specifically the desk scan has addresses the following four topics: Add any additional, relevant content that may have been identified since the submission of the original Desk Scan.Reorganize and enhance the original Desk Scan and.The purpose of the revised Desk Scan is to: This revised Desk Scan addresses the recommendations made by the National Academy of Science (NAS) Peer Review Panel concerning the originally submitted version of this scan. This report presents a revised version of the Desk Scan (Subtask V.E.2) developed to support the Modal Shift Comparative Analysis (Task V.E.) of the 2014 Comprehensive Truck Size and Weight Limits Study (2014 CTSW Study). Table of Contents Comprehensive Truck Size and Weight Limits Study - Modal Shift Comparative Analysis Technical Report Appendix A: Modal Shift Desk Scan CHAPTER 1 - Introduction 1.1 Purpose
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