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Pages 1-4

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From page 1...
... ENVIRONMENTAL ASSESSMENT OF AIR AND HIGH-SPEED RAIL CORRIDORS There is significant experience and research on the competition of air and high-speed rail (HSR) modes.
From page 2...
... 2 important framework for assessing air and HSR environmental comparisons, yet the language of NEPA alternatives assessments can preclude a full, detailed analysis of modal alternatives. Although there is a growing body of academic literature that seeks to reconcile spatial incompatibility, the academic literature is not bound by the same legal and institutional protocols of the environmental review process and therefore does not have to draw a constrained system boundary.
From page 3...
... 3 emissions per passenger-mile traveled, an average occupancy of 130 to 280 passengers is needed to compete with emerging aircraft and one of 80 to 180 passengers to compete with a 35-mpg sedan. Chester and Horvath then developed a consequential assessment to determine that, given future HSR adoption uncertainty, GHG payback will occur between 20 and 40 years, which includes emissions from construction and maintenance activities.
From page 4...
... 4 • A framework and methodology are needed to analyze the impact to airline operations, and thus airport infrastructure use, of development of HSR. The same goes for the "no build" alternative: estimating the future of aviation flows in the absence of HSR infrastructure is necessary.

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