United States Department of Transportation
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Improving Assignment Results for Air Quality Analyses
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1995-11-01
[PDF-2.72 MB]
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Edition:Final Report: September 1993 - August 1995
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Abstract:The hypothesis to be tested under this study was that improved 24-hour assignment results could be achieved by implementing time-of-day assignment procedures. The objectives of the study were: 1. To quantify the improvements in the 24-hour assignment results which can be obtained from using time-of-day modeling techniques in the development of 24-hour volume estimates. 2. To measure the impact of the time-of-day modeling approach on mobile source emission estimates versus those developed using 24-hour assignment results factored to represent time-of-day volume estimates. The Houston-Galveston regional travel models and base year data were selected as the data base for this study. Neither assignment technique emerged as clearly better in replicating the count-based volume estimates.
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