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Data Quality – Preliminary Results from visit from UW Researchers

Data Quality – Preliminary Results from visit from UW Researchers. Kristin Tufte, Robert L. Bertini, Yinhai Wang, Patikhom (Num) Cheevarunothai. Data Quality. Results from UW visit… 3 stations visited I-5 NB Kruse Way/217 I-5 NB Multnomah I-5 NB Bertha/Terwilliger

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Data Quality – Preliminary Results from visit from UW Researchers

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  1. Data Quality – Preliminary Results from visit from UW Researchers Kristin Tufte, Robert L. Bertini, Yinhai Wang, Patikhom (Num) Cheevarunothai

  2. Data Quality • Results from UW visit… • 3 stations visited • I-5 NB Kruse Way/217 • I-5 NB Multnomah • I-5 NB Bertha/Terwilliger • Investigated loop detector calibration and controller configuration using ALEDA

  3. Station Selection • Stations for study were selected based on several criteria • Observed anomalies in PORTAL plots • Unusually low occupancy (Terwilliger/Bertha) • Low overnight speeds (Kruse Way) • High rate of failure of TTI Maximum Occupancy Test (occupancy > 95%) (Multnomah) • Unusual flow/occupancy ratio • High rate of failure of TTI Maximum Speed test (speed > 100 mph) • High rate of failure of TTI Maximum Volume test (20-second volume > 17)

  4. I-5 NB OR 217/Kruse Way (mp 292.18) • Perceived Problem: Low nighttime speeds are a serious problem at this detector. Daytime speeds look reasonable. Lane 3 shows similar issues, lane 1 shows fewer issues with low nighttime speeds. • Fixes Applied: ALEDA used to tune loop detector sensitivity • Results: slight improvement in overnight speed – issues still not resolved • Cabinet Observations: Lane 1 (lane 3 in field) has different type of controller; suspect controller is thie issue for lanes 2 and 3

  5. I-5 NB OR 217/Kruse Way (mp 292.18) Sept 18, 2007 Lane 2 Sept 18, 2007 Lane 3 Sept 18, 2007 Lane 1 Sept 24, 2007 Lane 1 Sept 24, 2007 Lane 2 Sept 24, 2007 Lane 3

  6. I-5 NB Multnomah • Perceived Problems: • Lanes 1 and 3 exhibited a high number of readings with occupancy > 95% • Lanes 1 and 3 behaved very differently from lane 2. • Low overnight speeds • Cabinet Comments: cabinet was in poor shape, ALEDA could not be used due • Fixes Applied: Observed that a button that was pushed in (out?) on lane 2 was out (in?) on lanes 1 and 3. Pushed button in (out?) on lanes 1 and 3 • Results: Significant improvement in speed and occupancy measurements for lanes 1 and 3

  7. I-5 NB Multnomah (mp 296.6) (speed) Sept 19, 2007 Lane 2 Sept 19, 2007 Lane 3 Sept 19, 2007 Lane 1 Sept 21, 2007 Lane 1 Sept 21, 2007 Lane 2 Sept 21, 2007 Lane 3

  8. I-5 NB Multnomah (mp 296.6) (occupancy) Sept 19, 2007 Lane 2 Sept 19, 2007 Lane 3 Sept 19, 2007 Lane 1 Sept 21, 2007 Lane 1 Sept 21, 2007 Lane 2 Sept 21, 2007 Lane 3

  9. I-5 NB Bertha/Terwilliger (mp 297.33) • Perceived Problem: Unusually low occupancy • Fixes Applied: • Observed controllers were set to pulse mode, changed controller setting to medium presence mode • Used ALEDA to calibrate loop detector sensitivity • Results: significant improvement in occupancy measurements

  10. I-5 NB Bertha/Terwilliger Sept 19, 2007 - Speed All Lanes Sept 19, 2007 - Occupancy All Lanes Sept 20, 2007 - Speed All Lanes Sept 20, 2007 - Occupancy All Lanes

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