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Utilizing High-Resolution Archived Transit Data to Study Before-and-After Travel-Speed and Travel-Time Conditions

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Travis Glick, Portland State University

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Utilizing High-Resolution Archived Transit Data to Study Before-and-After Travel-Speed and Travel-Time Conditions

  1. 1. PRESENTED BY TRAVIS B. GLICK Before-and-After Studies Travel-Speed and Travel-Time Conditions
  2. 2. Who am I? Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras  Travis Bradley Glick  Chico, CA  BSCE & MSCE – PSU  Transportation, Technology, and People Laboratory  Transportation Research And Innovation Laboratory  Advisor: Miguel A. Figliozzi, PhD  Undergraduate Thesis  Master Thesis (Today’s Subject)  4 peer-reviewed publications  2015, 2016, and (2) 2017 Transportation Research Record
  3. 3. Why do we care? • Quantify changes to a roadway • Inform future decisions •Determine the impact of road diets on transit • Traditionally excluded • Understudied • Examine effect of new Transit only bridge • Evaluate performance of transit • Another use for transit high-resolution data Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  4. 4. How • Data • TriMet (Stop Level, Disturbance, and High-resolution) • Portland Metro • Math and Statistics (Details to come) • R-Studio and the R programming Language • Geographic Information Systems (GIS) and ArcMap Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  5. 5. Data Sources – Stop Level & Disturbance • Stop Level • Data collected at the bus stops • Ons, Offs, Lift, Dwell, Door Operations, Door Open Time • Widespread implementation • Widely used to analyze routes, segments, and bus stops • Well-studied • Disturbance Data • Data collected when the wheels stop Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  6. 6. 225 ft.25 ft. 50 ft. 75 ft. 100 ft. 125 ft. 150 ft. 175 ft. 200 ft. Time 1 Time 2 Time 3 High-Resolution Data Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  7. 7. Time 2 Time 3 Speed 1 Speed 2 Speed 3 Time 1 225 ft.25 ft. 50 ft. 75 ft. 100 ft. 125 ft. 150 ft. 175 ft. 200 ft. High-Resolution Data Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  8. 8. Time 2 Time 3 Speed 1 Speed 3 Speed 2 Time 1 225 ft.25 ft. 50 ft. 75 ft. 100 ft. 125 ft. 150 ft. 175 ft. 200 ft. High-Resolution Data Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  9. 9. Time 2 Time 3 Speed 1 Speed 3 Time 1 225 ft.25 ft. 50 ft. 75 ft. 100 ft. 125 ft. 150 ft. 175 ft. 200 ft. Speed 2 High-Resolution Data Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  10. 10. Data Sources – Combined Data Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras Disturbance Stop
  11. 11. Data Sources – GIS Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras • Useful for: • Route location • Route length • Overlapping Routes • Bus detours • Segment Analysis • Fast Data processing • Corrections for problematic data
  12. 12. The Process Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras • 25ft segments along each study area • Speeds extracted for each segment • before and after case • Compiled by: • Percentile • Time of Day
  13. 13. Percentiles Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  14. 14. Time of Day Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  15. 15. Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras _ = _ = After minus Before equals Difference
  16. 16. Speed Variability Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras • Difference in 85th and 15th percentiles
  17. 17. Speed Variability Index Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras • Speed Variability Divided by 50th Percentile
  18. 18. Propagation of Errors Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras • Statistics come with error • Error (from source 1) + Error (from source 2) = more error • But not linearly • Known formula for estimates when • Adding or subtracting values • Multiplying or dividing values • These assume independence of data sources • (small problem) The data is not independent
  19. 19. Road Diets • Reduce the width or number of travel lanes to add: • Bike lanes • Bike buffers • Transit lanes • Center turn lanes • Reduce travel speeds • Increase safety Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras&
  20. 20. When and Where • Portland, OR •Lombard Street (road diet) • Before: June and July 2015 • After: July and August 2016 • 16th Street (road diet) • Before: June and July 2015 • After: July and August 2016 Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras&
  21. 21. Study Area: Road Diet I Lombard Street • Reduced lane width • Removed parking • Moderate traffic volumes Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  22. 22. Study Area: Lombard Street Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  23. 23. Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras Before After
  24. 24. Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras Before Before
  25. 25. Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras After
  26. 26. Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras After Before
  27. 27. Study Area: Lombard Street Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  28. 28. Study Area: Lombard Street Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  29. 29. Study Area: Road Diet II 16th Street • Lane reduction project • Added Bike buffers • Low-moderate volumes Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  30. 30. Study Area: 16th Street Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  31. 31. Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras AfterBefore
  32. 32. Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras After
  33. 33. After Before Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  34. 34. Study Area: 16th Street Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  35. 35. Study Area: 16th Street Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  36. 36. Road Diets • Do road diets increase congestion for buses? • No. • Neither does it decrease congestion • Added stops will not necessarily slow down traffic Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras&
  37. 37. Study Area: Tilikum Crossing • Largest Vehicle Free bridge in the United States • Carries: • Light Rail • Buses • Street Car • Bikes • Pedestrians Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras http://www.hntb.com/HNTB/media/HNTBMediaLibrary/Expertise/Tilikum_Crossing_042web_1.jpg?ext=.jpg
  38. 38. The When and Where • Portland, OR •Powell Blvd and Route 9 • Before: September 2014 • After: August 2016 Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  39. 39. Study Area: Tilikum Crossing Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  40. 40. Study Area: Tilikum Crossing Before After After: Eastbound = 2.0 miles Westbound = 2.2 miles Before: Eastbound = 2.0 miles Westbound = 2.0 miles Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  41. 41. Study Area: Tilikum Crossing Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  42. 42. Study Area: Eastside of Bridge
  43. 43. Study Area: Eastside of Bridge Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  44. 44. Study Area: Eastside of Bridge Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  45. 45. Study Area: Eastside of Bridge Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  46. 46. Study Area: Eastside of Bridge Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  47. 47. Study Area: Tilikum Crossing Before After After: Eastbound = 2.0 miles Westbound = 2.2 miles Before: Eastbound = 2.0 miles Westbound = 2.0 miles Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  48. 48. Travel Time Percentiles: Westbound – All Day Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  49. 49. Travel Time Percentiles: Westbound – AM Peak Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  50. 50. Travel Time Percentiles: Westbound – PM Peak Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  51. 51. Travel Time Percentiles: Eastbound – All Day Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  52. 52. Travel Time Percentiles: Eastbound – AM Peak Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  53. 53. Travel Time Percentiles: Eastbound – PM Peak Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  54. 54. Travel Time: 7.6 miles
  55. 55. Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  56. 56. Costs Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  57. 57. Study Area: Tilikum Crossing Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras • Travel Time Increased • Range of travel times in peak period was reduced • Increase on-time performance • Assist with operational planning • This can save TriMet money
  58. 58. Conclusions Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras • The methodologies can quantify roadway changes • Apply methodologies in new ways • Provide insights into how a change impacted transit and vehicles • Show how travel time reliability changes • Small road diets are unlikely to increase congestion
  59. 59. Thank you to the following:
  60. 60. Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras Thank you for Listening Any Questions?
  61. 61. Propagation of Errors (cont.) Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras • In graphics, the thickness of lines is confidence interval • Determined by propagation of error estimates • Correlation and Covariance • 85th – 15th • 85th (after) – 85th (before) • (85th – 15th) / 50th
  62. 62. Assumption of Normality Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  63. 63. Assumption of Normality Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras
  64. 64. Introduction Methodology Road Diet I Road Diet II Tilikum Crossing Conclusions Questions Extras

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