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July 31, 2006 Robert Bertini Sue Ahn

Using Archived Data to Measure Operational Benefits of a System-wide Adaptive Ramp Metering (SWARM) System Task 4: Pilot Study. July 31, 2006 Robert Bertini Sue Ahn. Presentation Outline. Work Plan – Progress Pilot Study Data Collected Data Analysis Results Remaining Task – TAC input

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July 31, 2006 Robert Bertini Sue Ahn

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  1. Using Archived Data to Measure Operational Benefits of a System-wide Adaptive Ramp Metering (SWARM) SystemTask 4: Pilot Study July 31, 2006 Robert Bertini Sue Ahn

  2. Presentation Outline • Work Plan – Progress • Pilot Study • Data Collected • Data Analysis • Results • Remaining Task – TAC input • Recommendations for the Regional Study

  3. Work Plan - Progress • Task 1: Literature Review • Report under revision • Task 2: Corridor Selection • Report under review • Task 3: Data Collection Plan • Report under review • Task 4: Pilot Study • Freeway performance • On-ramp performance - ongoing

  4. On-ramp Queue Storage: Morning Peak Hours (6:30-8:30AM)

  5. On-ramp Queue Storage: Morning Peak Hours (4:30-6:30PM)

  6. Pilot Study: Data Collection

  7. Pilot Study: Data Collection • Pre-timed: June 19 – 23, 2006 • SWARM: June 26 – 30, 2006 • Accidents: June 21 and June 30 (excluded from analysis) • Weather: Comparable (high temperature on the 2nd week)

  8. Pilot Study: Data Analysis • Data Quality: Communication Failures • Freeway: VMT, VHT, Travel Time, Delay • On-ramps: Queue spill-over • Frequency • Durations • Total delay: on-going  Challenge

  9. Communication Failures

  10. Performance Measures (6-9AM)

  11. What happened?? • SWARM is not operating optimally • Parameters need to be fine-tuned • Effect of communication failures • Smaller discharge rate from the bottleneck • Larger freeway delay but smaller system-wide delay • Larger inflow from the on-ramps • Short pilot study duration: The results are not statistically significant.

  12. Delay (Pre-timed) Difference in delay (vehicle-hours) Travel Direction

  13. Delay (SWARM) Difference in delay (vehicle-hours) Travel Direction

  14. Change in Delay (SWARM – Pre-timed) Difference in delay (vehicle-hours) Travel Direction

  15. Change in Delay Delay (veh-hrs)

  16. On-ramp Volumes: Morning Peak Hours (6:30-8:30AM)

  17. Pilot Study: Queue Spill-over

  18. Pilot Study: Queue Spill-over

  19. Pilot Study: Queue Spill-over Scholls-Ferry Rd. Beaverton-Hillsdale Highway

  20. Next Steps • Reasons for the increase in delay • More analysis on on-ramps • Total delay? – require counts at meters • Travel time (sampling frequency) • Report

  21. Recommendations • Data near bottleneck to measure bottleneck discharge flow • Agree on performance measure for on-ramps • Total delay, queue length, queue spill-over • All or selected on-ramps • Data collection method for on-ramps • Video: time-consuming for total delay

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