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:
  • Traffic counts
  • Annual average daily traffic
  • Time duration
  • Statistical analysis
  • 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.
  More +
• Format:
  PDF
• Funding:
  R27-SP22
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28799/dot_28799_DS1.pdf
• File Type:
  [PDF - 1.18 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:2b4c31d749ff109ab83c0e0c1bfa3642d0fdf5f768b21fc196be6e2c023e649a