1 / 17

Analyzing Green Occupancy Ratio and Arrival Type for Enhanced Traffic Signal Performance

This document explores the concepts of Green Occupancy Ratio (GOR) and Arrival Type (AT) as metrics for evaluating traffic signal performance. It outlines the data requirements, theoretical background, and performance analysis related to how vehicles interact with traffic signals. The significance of event-based data collection, especially at 0.1-second resolution, is emphasized for accurate performance assessment. The potential benefits of these measures, including improvements in signal efficiency and reduction in vehicle delay, are highlighted through qualitative and quantitative approaches, including case studies.

debra-baldwin
Télécharger la présentation

Analyzing Green Occupancy Ratio and Arrival Type for Enhanced Traffic Signal Performance

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Performance Measures Edward J. Smaglik September 18th, 2012

  2. Green Occupancy Ratio (GOR) and Arrival Type (AT) • Data requirements • Theory • Performance data • Signal Performance • Progression Performance

  3. Data Requirement • Event based data (0.1 second resolution) • Controller or other data collection device • Phase and detector status • GOR: Phase, stopbar presence • AT: Phase, advance count (presence can be used)

  4. Why event based data? • Aggregation removes fidelity • Aggregation typically based upon minutes • Does not align with cycles Average = 53.333%

  5. Green Occupancy Ratio where • Og = Occupancy of a green interval i • Ld = Length of detection zone • Lc = Length of vehicle • Vc = Velocity of vehicle • tg= time gap between vehicles • th = time headway between vehicles

  6. Green Occupancy Ratio • Measure of signal performance • Higher volume, less detector off time, higher metric value • Metric value dependent on vehicle speed and detection zone length • Lower speeds => Higher metric value • Shorter detection zone => Lower metric value

  7. Green Occupancy Ratio • Comparison to V/C, with different detection zone lengths

  8. Arrival Type • Measure of progression performance • Well known Highway Capacity Manual concept • Value has impact on delay calculation • Value can be developed • Qualitatively • Quantitatively

  9. Arrival Type - Qualitative Exhibit 10-18, HCM 2000

  10. Arrival Type - Quantitative Rp = Platoon Ratio P = Percent of Vehicle Arriving on Green C = Cycle Length G = Length of green interval

  11. Arrival Type Sample Data 100 45 53 69 83 10 44 15 36 27

  12. Arrival Type Sample Data

  13. City of Mesa test intersection • E. Southern Rd & S. Power Ave located on the east side of Mesa • Geography • Adjacent to Shopping Mall and Retirement Community • ½ mi north of US 60 • Wide Streets • Adaptive control system location

  14. Generic Data Collection Diagram Data Collection Device

  15. What do I need? • Event based data logger • Adaptive system • Available on certain: • Traffic controllers • Video detection devices • Standalone device • Access to detector and phase state changes on 0.1s resolution

More Related