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Web-Only Document 93: Technical Appendix to NCHRP Report 571: Standardized Procedures for Personal Travel Surveys National Cooperative Highway Research Program Contractorâs Final Report for NCHRP Project 8-37 Submitted Nov. 2004, Revised March 2005 & Dec. 2007 NCHRP Louisiana State University Westat NuStats The Franklin Hill Group Kay Axhausen Joanne H. Pratt Associates Socialdata GmbH Lee-Gosselin Associates Alan Pisarski Institute of Transport Studies, The University of Sydney