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The paper presents a review of sample size issues related to regionalhousehold travel surveys. A review of current practices reveals that differentperspectives and, as a result, different practices exist in Canada, US, andabroad on sample size. The paper uses data from the Transportation TomorrowSurvey (TTS) - a household travel survey conducted every five years in theGreater Toronto and Hamilton Area (GTHA) - for a set of empiricalinvestigations that asses the adequacy of household travel survey samples. Theempirical investigations reveal that even with a 5% sample size, a fullrepresentation of the population and its corresponding travel behaviour may bedifficult (at the 95% confidence level). Therefore, based on the results of theempirical investigations and the literature review, the paper proposes aflexible framework for household travel survey sample size determination,especially for Canadian municipalities.

How Large is too Large? A Review of the Issues related to Sample Size  Requirements of Regional Household Travel Surveys with a Case Study on the  Greater Toronto and Hamilton Area (GTHA)