ESTIMATING AVERAGE ANNUAL DAILY TRAFFIC FLOW FROM SHORT PERIOD COUNTS

The Philips and Blake (1980) method of counting traffic in the United Kingdom is described, and a study is described which examined the method and determined its applicability in estimating AADT (average annual daily traffic) in the United States. Philips and Blake defined a short count as one continuous count of traffic at a site for a period of less than 24 hours. A two stage process is utilized to estimate a daily and an annual flow from a short period count. The short period is first expanded to the daily total and then expanded to the annual total. This study attempted to determine the effect of duration between 4 and 16 hours on accuracy, and the best time period to begin each count. The study also determined the expansion factors for each length of count, and the month of the year that would be most appropriate for estimating AADT. The overall level of accuracy of the method was also determined.

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  • Corporate Authors:

    Institute of Transportation Engineers (ITE)

    Washington, DC  United States 
  • Authors:
    • Erhunmwunsee, P O
  • Publication Date: 1991-11

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Filing Info

  • Accession Number: 00617127
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Nov 30 1991 12:00AM