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Unlike employment status, the finding that proxy- reported travel is associated with higher propensities of underreported travel is well documented. While the most obvious solution is not to allow any proxy reporting, the cost implications of such a decision are tremendous and may introduce more bias into the survey data than that introduced by allowing proxy reporting. A second, but 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 to the recommendation above for strengthening the travel of unemployed persons. In summary, this paper has examined the driver demo- graphics, driver travel characteristics, and driver adher- ence to survey protocol considerations that affect the likelihood of underreporting as well as the level of trip underreporting. These results can be used to adjust for underreporting in traditional household travel surveys, to improve travel survey data collection procedures, or both. Although the authors plan to replicate this analysis on future travel surveys with GPS components, they believe that the survey method improvements identified in this study will enhance the collection of complete trip information in any household travel survey. REFERENCES Bricka, S., and C. R. Bhat. A Comparative Analysis of GPS- Based and Travel Survey- Based Data. University of Texas at Austin, July 2005. NuStats. Kansas City Regional Household Travel Survey: GPS Study Final Report. Mid- America Regional Council, Kansas City, Missouri, 2004. 93USING GLOBAL POSITIONING SYSTEM DATA TO INFORM TRAVEL SURVEY METHODS