Optimizing freight routes and modes to minimize environmental impacts : integrating truck emissions cost in traffic assignment.
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2014-10-01
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Abstract:Adverse impacts of greenhouse gasses (GHG) and the imperative for reducing the production are well established. The ; transportation sector accounts for 28% of all U.S. GHG production. Heavy-duty vehicles (e.g., large freight trucks) account for ; nearly 1/5 of the U.S. total and this fraction is growing. Most current efforts emphasize one of four areas: (1) engineering ; improvements to improve fuel economy or reduce emissions, (2) shifts to other transport modes, (3) improved logistics to reduce ; the movement of partially full or empty containers, and (4) reduced travel costs for individual trucks. A small fraction of studies ; have assessed modifications to route choice considerations as a means of improving fuel economy of individual vehicles. These ; studies suggest the potential gains are very small. In this study, potential gains of emissions-based route choice were assessed by ; integrating the EPA Motor Vehicle Emissions Simulator (MOVES) with a macroscopic regional traffic demand model. For this ; integration, route choices included a simplified emission calculation within the repeated model iteration runs of a Frank-Wolfe ; type algorithm. Analyses suggest reductions of freight truck emissions are possible and show an example where the total systems ; truck emission was reduced by up to 0.61% (88.8 tons).
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Main Document Checksum:urn:sha256:d7bc36087ed1e68c6e533286e2baf321393b3e1ab49902ac8c534ab77086b963