Medium- and heavy-duty trucks, motor coaches, and transit buses - collectively, "medium- and heavy-duty vehicles", or MHDVs - are used in every sector of the economy. The fuel consumption and greenhouse gas emissions of MHDVs have become a focus of legislative and regulatory action in the past few years. This study is a follow-on to the National Research Council's 2010 report, Technologies and Approaches to Reducing the Fuel Consumption of Medium-and Heavy-Duty Vehicles. That report provided a series of findings and recommendations on the development of regulations for reducing fuel consumption of MHDVs.
On September 15, 2011, NHTSA and EPA finalized joint Phase I rules to establish a comprehensive Heavy-Duty National Program to reduce greenhouse gas emissions and fuel consumption for on-road medium- and heavy-duty vehicles. As NHTSA and EPA began working on a second round of standards, the National Academies issued another report, Reducing the Fuel Consumption and Greenhouse Gas Emissions of Medium- and Heavy-Duty Vehicles, Phase Two: First Report, providing recommendations for the Phase II standards. This third and final report focuses on a possible third phase of regulations to be promulgated by these agencies in the next decade.
National Academies of Sciences, Engineering, and Medicine. 2020. Reducing Fuel Consumption and Greenhouse Gas Emissions of Medium- and Heavy-Duty Vehicles, Phase Two: Final Report. Washington, DC: The National Academies Press. https://doi.org/10.17226/25542.
|2 Setting the Stage: Regulatory Horizons, Challenges, and Influences
|3 Certification, Compliance, and Enforcement
|4 Powertrain Technologies
|5 Technologies for Reducing the Power Demand of MHDVs
|6 Projected Benefits of Technologies on Fuel Consumption
|7 Hybrid and Electric Powertrain Technologies
|8 Battery Technology for Medium- and Heavy-Duty Hybrid and Electric Vehicles
|9 Freight Operational Efficiency
|10 Intelligent Transportation Systems and Automation
|11 Manufacturing Considerations
|12 Costs and Benefits
|13 Alternative and Complementary Regulatory Approaches
|Appendix A: Committee Biographies
|Appendix B: Disclosure of Conflicts of Interest
|Appendix C: Committee Activities
|Appendix D: Summary of Analysis of Engine and Vehicle Combinations
|Appendix E: Description of Drive Cycles Used for Compliance
|Appendix F: Summary of Committee's First Report: Reducing the Fuel Consumption and Greenhouse Gas Emissions of Medium- and Heavy-Duty Vehicles, Phase Two: First Report
|Appendix G: Acronyms and Abbreviations
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