Analysis of 24-hour versus 48-hour traffic counts for HPMS sampling.

Details

• Creators:
  Hall, James P. ; Sung, Chung-Hsien ; Morgan, William
• Corporate Creators:
  University of Illinois at Springfield
• Corporate Contributors:
  Illinois. Dept. of Transportation. Bureau of Materials and Physical Research ; United States. Federal Highway Administration
• Subject/TRT Terms:
  Annual Average Daily Traffic Statistical Analysis Time Duration Traffic Counts Traffic Data
• Publication/ Report Number:
  FHWA-ICT-14-007 ; ICT-14-007 ; UILU-ENG-2014-2007
• Resource Type:
  Tech Report
• Geographical Coverage:
  Illinois
• Corporate Publisher:
  Illinois Center for Transportation
• Abstract:
  The Illinois Department of Transportation (IDOT) has requested a waiver from the Federal Highway Administration (FHWA) to
  
  allow IDOT to implement a 24-hour traffic-count program on the non-state HPMS routes, as opposed to the current Highway
  
  Performance Monitoring System (HPMS) count cycle and duration requirement for a 48-hour minimum counting cycle. IDOT
  
  proposes to count these routes twice in a 5-year cycle. IDOT’s concern is that the collection of 24-hour counts, as opposed to
  
  48-hour counts, would enable more efficient use of agency resources, yet still maintain the statistical integrity of the annual
  
  average daily traffic (AADT) estimation process for HPMS reporting. IDOT had conducted research in the 1980s comparing
  
  the two count durations and has been following the conclusions from that study in conducting 24-hour counts. IDOT had been
  
  granted an FHWA waiver for the 24-hour counts on state routes since 1992. Because traffic patterns have changed over the
  
  years, IDOT wanted to review the relative differences between the two count durations.
  
  The objective of this study was to perform a statistical analysis on IDOT’s automated traffic recorder (ATR)
  
  continuous-count traffic data, collected from 103 statewide ATR locations, to compare the relative differences between 24-
  
  hour count periods and 48-hour count periods that are factored to compute AADT. Statistical analyses were performed for
  
  statewide ATR data across various roadway functional classification categories and also split by District 1 and downstate
  
  (Districts 2–9). In general, the analyses found that, with the application of appropriate daily traffic-count adjustment factors,
  
  the 24-hour counts were statistically comparable to 48-hour traffic counts.
  
  
• Format:
  PDF
• Funding:
  R27-SP22
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:2b4c31d749ff109ab83c0e0c1bfa3642d0fdf5f768b21fc196be6e2c023e649a
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28799/dot_28799_DS1.pdf
• File Type:
  [PDF - 1.18 MB ]