Assessing Roadway Traffic Count Duration and Frequency Impacts on AADT Estimations

The objectives of this research project are to gain a quantitative understanding on: (1) How various short term traffic count durations affect and relate to estimated annual average daily traffic (AADT) as compared with long term continuous counting program estimations. The ultimate goal is to enable the Federal Highway Administration (FHWA) to provide the most feasible and technically sound guidance to States and other agencies on this issue. (2) How missing data from long term traffic monitoring data affects the AADT estimation and establish the critical threshold in terms of data usability. In other words, how much data can be missing and what type of data patterns missing can be tolerated in AADT estimation without any special consideration such these steps used in converting short term counts to AADT. (3) Traffic monitoring methods from a given segment on an annual basis with a 24 hour traffic count program (counted on a frequency of every year) vs. monitoring the same segment on a once every three year (with every 2nd and 3rd year factored to bring them to current year) basis but with a minimum 48 or 72 hour hour count and how these three different methods can effect AADT data on an annual basis.


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Filing Info

  • Accession Number: 01573308
  • Record Type: Research project
  • Source Agency: Federal Highway Administration
  • Contract Numbers: TPF-5(292)
  • Files: RiP, USDOT
  • Created Date: Aug 22 2015 1:00AM