The 1980 census urban transportation planning package (utpp) is a large-scale source of observed travel times derived from the journey-to-work data. Plans for the 1990 census indicate that work trip times will again be collected. These data are incomplete, however, inthat most cells in the interdistrict matrix have no census travel time observation. This paper explores the accuracy and usefulness of census travel time data versus survey- and network-based methods andairline distance approaches at the minor civil division (mcd) levelof analysis. A promising technique to extract and edit the census data and to synthesize the missing observations is developed. This paper appears in transportation research record no. 1236, Transportation data 1989.
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