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.
- Record URL:
- Record URL:
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Corporate Authors:
RSG, Incorporated
55 Railroad Row
White River Junction, VT United States 05001Utah Department of Transportation
4501 South 2700 West
Salt Lake City, UT United States 84114-8410Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC United States 20590 -
Authors:
- Swanson, Ben
- Culp, Justin
- Publication Date: 2022-2
Language
- English
Media Info
- Media Type: Digital/other
- Edition: Final Report
- Features: Appendices; Figures; Maps; Tables;
- Pagination: 46p
Subject/Index Terms
- TRT Terms: Data analysis; Forecasting; Highway capacity; Regression analysis; Traffic volume; Travel time reliability
- Geographic Terms: Utah
- Subject Areas: Data and Information Technology; Highways; Operations and Traffic Management; Planning and Forecasting;
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