Assessing Mechanisms for Integrating Transportation-Related Greenhouse Gas Reduction Objectives into Transportation Decision Making (2010) / Chapter Skim
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Pages 59-74
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NCHRP Project 20-24 (64) Final Report 59 5.
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NCHRP Project 20-24 (64) Final Report 60 MPOs also have experience with emissions modeling through the conformity process.
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NCHRP Project 20-24 (64) Final Report 61 HPMS provides limited data for the entire universe of public roads and more detailed information for a sample of these segments.
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NCHRP Project 20-24 (64) Final Report 62 HPMS is available free from FHWA, and summary statistics are reported in Highway Statistics.
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NCHRP Project 20-24 (64) Final Report 63 travel models can be more complex or simpler, depending on the resources and needs of the region.
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NCHRP Project 20-24 (64) Final Report 64 Other State-Level VMT Forecasting Methods Many states develop VMT forecasts without the use of network-based travel demand models.
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NCHRP Project 20-24 (64) Final Report 65 models are inadequate to address many of these new concerns."42 Below are some key points on this subject.
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NCHRP Project 20-24 (64) Final Report 66 prices, with the exception that models containing mode choice components would see a shift in some trips from automobile modes to other modes as the relative cost of driving increases.
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NCHRP Project 20-24 (64) Final Report 67 time-dependent demand.44 However, use of dynamic traffic assignment for a full region is not yet a feasible option for MPOs because of the required computational time and resources.45 State Level Most DOTs produce statewide VMT forecasts, but few do so using travel models or other methods that are sensitive to policies and strategies that affect VMT.
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NCHRP Project 20-24 (64) Final Report 68 Scenario Planning A number of MPOs are using scenario planning to evaluate the impacts of alternative regional growth scenarios.
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NCHRP Project 20-24 (64) Final Report 69 Energy Information Administration data.
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NCHRP Project 20-24 (64) Final Report 70 A critical issue for transportation agencies is the extent to which regional-level GHG forecasts can capture the effects of system efficiency improvements that seek to improve traffic flow.
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NCHRP Project 20-24 (64) Final Report 71 For transportation agencies, the main limitation of the fuel-based approach is the lack of sufficient detail to assess emission reduction strategies.
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NCHRP Project 20-24 (64) Final Report 72 emissions impacts of specific types of transportation strategies.
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NCHRP Project 20-24 (64) Final Report 73 The tools and techniques for analyzing operations strategies is an area of on-going research, led in part by FHWA.52 Some of the most common current methods for analyzing operations strategies are outlined below.53 Sketch planning tools produce general order-of-magnitude estimates of travel demand and traffic operations in response to transportation improvements.
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NCHRP Project 20-24 (64) Final Report 74 trucks and locomotives.
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