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Bottleneck Identification on Oregon 217 with PORTAL Data

Bottleneck Identification on Oregon 217 with PORTAL Data. Zachary Horowitz David Evans and Associates Dr. Robert Bertini Portland State University. TRB 86 th Annual Meeting. Washington, DC. January 2007. Presentation Outline. Research Objectives Study Area / Methodologies

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Bottleneck Identification on Oregon 217 with PORTAL Data

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  1. Bottleneck Identification on Oregon 217 with PORTAL Data Zachary Horowitz David Evans and Associates Dr. Robert Bertini Portland State University TRB 86th Annual Meeting Washington, DC. January 2007.

  2. Presentation Outline Research Objectives Study Area / Methodologies Analysis and Results Conclusions TRB 86th Annual Meeting - DC 2007

  3. Research Objectives 1st Bottleneck Study in Portland Create a Learning Tool for Students Measure Capacity on 217 Compare Non/Recurrent Congestion TRB 86th Annual Meeting - DC 2007

  4. S Study Area - Overview • Oregon Highway 217 • 7 miles long • North to South trips from US 26 and I-5 • Connects Portland, Beaverton & Tigard • Study Almanac • Dates: Tuesday-Thursdays, February - May 2006 • Times: 6:00 – 10:00 AM • Southbound travel direction (towards I-5) TRB 86th Annual Meeting - DC 2007

  5. South South Study Area - Infrastructure • Traffic Data • Oregon Department of Transportation (ODOT) • 9 sets of inductive loop detectors, and all on-ramps • 20-second data aggregation • Volumes, occupancy and speed (calculated) • Data retrieved through PORTAL online system located at Portland State University TRB 86th Annual Meeting - DC 2007

  6. S Study Area - Operations • Mainline at 7:00am • 2 lanes • ~ 1900 vehicles/hr/lane • Scholls Ferry On-Ramp • Metered at 700 vehicles/hr • Operating at capacity • Greenburg Off-ramp • Heavy weaving volumes • Geometry • 45° bend south of on-ramp • Interchange spacing Scholls Ferry live.com TRB 86th Annual Meeting - DC 2007

  7. Methodology • Cumulative counts • Raw 20-sec occupancy • Oblique, transformed curves • Q=KV scatter plot • Speed plots TRB 86th Annual Meeting - DC 2007

  8. Raw Occupancy Plot TRB 86th Annual Meeting - DC 2007

  9. Flow vs. Occupancy Scholls Ferry Road – February 7, 2006 TRB 86th Annual Meeting - DC 2007

  10. Queued and Unqueued States Scholls Ferry – February 7, 2006 TRB 86th Annual Meeting - DC 2007

  11. Flow vs. Occupancy Greenburg Road – February 7, 2006 TRB 86th Annual Meeting - DC 2007

  12. Speed Plots Denney Rd - 7:25 Hall Blvd – 7:22 Allen Blvd – 7:28 Beaverton-Hillsdale – 7:35 TRB 86th Annual Meeting - DC 2007

  13. Occupancy Plot TRB 86th Annual Meeting - DC 2007

  14. Results TRB 86th Annual Meeting - DC 2007

  15. Congestion Comparison • Recurrent congestion • Discharge flow: 3,620 vph • Flow drop: 3.9% • Shock speed: 8.8 mph • Incident-related congestion • Discharge flow: 2,850 vph • Flow drop: 20.4% • Shock speed: 18.2 mph TRB 86th Annual Meeting - DC 2007

  16. Conclusions • Recurrent SB congestion during AM • Flow drop similar to previous studies Main causes of congestion: • Heavy mainline flow + on-ramp volumes • Substandard geometries along 217 • Heavy weaving volumes Effective operational capacity: 2,000 vphpl TRB 86th Annual Meeting - DC 2007

  17. Future Study • Collect off-ramp data • Integration with ramp metering project • HCM analyses (weaving, freeway) • Upgrade loop hardware (direct speed measurement) • Freight data collection • ODOT 217 corridor study TRB 86th Annual Meeting - DC 2007

  18. Acknowledgements • ODOT • Dr. Robert Bertini • Steve Boice • Sirisha Kothuri • TRB reviewers TRB 86th Annual Meeting - DC 2007

  19. Questions? ??? TRB 86th Annual Meeting - DC 2007

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