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U S I N G G L O B A L P O S I T I O N I N G S Y S T E M D ATA T O I N F O R M T R AV E L S U RV E Y M E T H O D S 93 Unlike employment status, the finding that proxy- underreporting in traditional household travel surveys, reported travel is associated with higher propensities of to improve travel survey data collection procedures, or underreported travel is well documented. While the most both. Although the authors plan to replicate this analysis obvious solution is not to allow any proxy reporting, the on future travel surveys with GPS components, they cost implications of such a decision are tremendous and believe that the survey method improvements identified may introduce more bias into the survey data than that in this study will enhance the collection of complete trip introduced by allowing proxy reporting. A second, but information in any household travel survey. also costly, approach is to only allow proxy interviews if the travel log is used. The better solution here may be to strengthen the telephone interview in a manner similar REFERENCES to the recommendation above for strengthening the travel of unemployed persons. Bricka, S., and C. R. Bhat. A Comparative Analysis of GPS- In summary, this paper has examined the driver demo- Based and Travel Survey-Based Data. University of Texas graphics, driver travel characteristics, and driver adher- at Austin, July 2005. ence to survey protocol considerations that affect the NuStats. Kansas City Regional Household Travel Survey: GPS likelihood of underreporting as well as the level of trip Study Final Report. Mid-America Regional Council, underreporting. These results can be used to adjust for Kansas City, Missouri, 2004.