Expanding Metropolitan Highways : Implications for Air Quality and Energy Use -- Special Report 245

EXPANDING METROPOLITAN HIGHWAYS -- Copyright -- Preface -- Contents -- Executive Summary -- REGULATORY CONTEXT -- ANALYTIC REQUIREMENTS -- FINDINGS -- CONCLUDING OBSERVATIONS -- REFERENCES -- ABBREVIATIONS -- 1 Introduction -- REGULATORY CONTEXT -- Clean Air Legislation and Regulatory Requirements -- Historical Trends -- Requirements of the 1990 CAAA -- Conformity Requirements -- ISTEA -- Energy Regulation -- STUDY FOCUS -- DEFINITION OF TERMS -- OVERVIEW OF IMPACTS -- ASSESSMENT OF IMPACTS -- ORGANIZATION OF REPORT -- NOTES -- REFERENCES -- ABBREVIATIONS -- 2 Contribution of Motor Vehicle Transportation to Air Pollution and Energy Consumption -- TRANSPORTATION AND AIR QUALITY -- Transportation-Related Pollutants -- Formation of Motor Vehicle Emissions -- Major Pollutants by Type -- Pollutants by Vehicle and Fuel Type -- Factors Affecting In-Use Emission Levels -- Travel-Related Factors -- Trips and Vehicle Use -- Speed, Acceleration, and Load -- Driver Behavior -- Highway-Related Factors -- Vehicle-Related and Other Factors -- Translating Emissions into Air Quality -- TRANSPORTATION AND ENERGY CONSUMPTION -- Energy and the Environment -- Factors Affecting In-Use Fuel Economy -- Travel-Related Factors -- Driver Behavior -- Highway-Related Factors -- Vehicle-Related and Other Factors -- MODELING AIR QUALITY AND ENERGY IMPACTS -- Introduction to Modeling Requirements and Approaches -- Land Use and Travel Demand Models -- Land Use Models -- Travel Demand Models -- Traffic Simulation Models -- Emission and Atmospheric Dispersion Models -- Emission Models -- Atmospheric Dispersion Models -- Energy Models -- Limitations of Current Modeling Practice -- SUMMARY -- NOTES -- REFERENCES -- ABBREVIATIONS -- 3 Traffic Flow Characteristics -- OVERVIEW OF EXPECTED IMPACTS -- REVIEW OF EFFECTS ON EMISSIONS -- Effects of Changes in Traffic Flow Patterns.