Forecasting Travel-Time Reliability

This analysis examined passively collected probe-vehicle travel-time data and traditional traffic counts to identify relationships between travel-time reliability and volume-to-capacity (V/C) ratios. Travel time and traffic volume data came from Utah Department of Transportation (UDOT) data portals, and roadway capacities came from the Wasatch Front Travel Demand Model. RSG used the buffer-time index (BTI) metric to represent travel-time reliability in this analysis. Historical BTI values were calculated from observed travel-time data for study roadways. Observed traffic volumes and model roadway capacities were used to calculate V/C ratios for these same roadways. Relationships between V/C and BTI were established through regression analysis separately for freeway, ramp, and arterial roadways, after identifying and filtering out nonrecurring congestion events results using historical weather and crash data. BTI versus V/C lookup tables were established from these regressions and used to assign BTI values to model roadway links based on model V/C ratios.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Figures; Maps; Tables;
  • Pagination: 46p

Subject/Index Terms

Filing Info

  • Accession Number: 01843630
  • Record Type: Publication
  • Report/Paper Numbers: UT- 22.05, Work Unit No. 5H086 44H
  • Contract Numbers: 21-8592
  • Files: NTL, TRIS, ATRI, USDOT, STATEDOT
  • Created Date: Apr 25 2022 10:07AM