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4 AUTHOR ACKNOWLEDGMENTS The research reported herein was performed under NCFRP 11 Identification and Evaluation of Freight Demand Factors by Halcrow, Inc. and the Texas Transportation Institute (TTI). Halcrow Inc. was the consultant for this study with the Texas Transportation Institute serving as sub- consultant. Robert West, Trade and Transportation Principal at Halcrow, was the initial Project Manager, with Douglas Rubin replacing him in the late fall of 2010 a s co-Principal Investigator. Juan Carlos Villa, Associate Research Scientist at the Texas Transportation Institute was the other co- Principal Investigator.