This paper summarizes the rsults of a postcard origin-destination (o-d) survey conducted to estimate intercity travel patterns in the interstate 35 corridor between austin and san antonio, texas. The paper discusses the study design, data-collection and data-processing procedures, methods used to check the representativeness of the sampled data, expansion of the sampled data to represent total corridor travel, and study costs. The results of the study indicate that the postcard o-d survey method can be used to develop representative, reliable estimates of intercity corridor travel patterns. Additionally, the results of this study show that with a good traffic controlplan and a well-trained survey crew, this survey method can be safely implemented without causing any substantial traffic delays, even on high-volume intercity and interstate freeways. This paper appearsin transportation research record no. 1236, Transportation data 1989.
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