National Academies Press: OpenBook

Guide for Conducting Benefit-Cost Analyses of Multimodal, Multijurisdictional Freight Corridor Investments (2017)

Chapter: Appendix G - Shortcut for Analysis of Generated Traffic

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Page 144
Suggested Citation:"Appendix G - Shortcut for Analysis of Generated Traffic." National Academies of Sciences, Engineering, and Medicine. 2017. Guide for Conducting Benefit-Cost Analyses of Multimodal, Multijurisdictional Freight Corridor Investments. Washington, DC: The National Academies Press. doi: 10.17226/24680.
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Page 144

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144 A p p e n d i x G Litman (1) provides shortcut methods using demand elasticities to forecast changes in travel speeds calculated as elasticities applied to generalized costs (when using fixed demand). A time elasticity range of -0.5 to -0.8 is recommended or -0.03 price elasticity to all generalized costs. Alternatively, he recommends the use of a capacity elasticity of -0.1 to lane miles (applicable only for highways). Elasticities, if representative of the context, may be used as part of a sensitivity analysis for dealing with induced volume. Induced demand can be mostly addressed if the demand model capabilities exist by using network (or matrix)–based determination of travel times, and value of travel time savings to account for most of the induced and diverted demand when a single mode is impacted (e.g., highway). Reference 1. Litman, T. Generated Traffic and Induced Demand. Victoria Transport Policy Institute, 2015. http://www.vtpi. org/gentraf.pdf. Shortcut for Analysis of Generated Traffic

Next: Appendix H - Emission Factors and Emission Costs »
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TRB's National Cooperative Freight Research Program (NCFRP) Research Report 38: Guide for Conducting Benefit-Cost Analyses of Multimodal, Multijurisdictional Freight Corridor Investments explores how to conduct benefit-cost analyses (BCAs). A BCA is an analytical framework used to evaluate public investment decisions including transportation investments. BCA is defined as a collection of methods and rules for assessing the social costs and benefits of alternative public policies. It promotes efficiency by identifying the set of feasible projects that would yield the largest positive net benefits to society.

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