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Accessible Pedestrian Signals

Presented by: Joe Couples, P.E. Valerie Lee, P.E. Accessible Pedestrian Signals. Legacy devices remain ...but mostly new technology. Seattle APS. Accessible Pedestrian Signals (APS). MUTCD 4E.06 Both audible and vibro-tactile modes identified for walk indication.

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Accessible Pedestrian Signals

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  1. Presented by: Joe Couples, P.E. Valerie Lee, P.E. Accessible Pedestrian Signals

  2. Legacy devices remain...but mostly new technology.

  3. Seattle APS

  4. Accessible Pedestrian Signals(APS) MUTCD 4E.06 • Both audible and vibro-tactile modes identified for walk indication. • Locator tone identified in support section. • Provides guidance for factors that should be considered in study of when to install an Accessible Pedestrian Signal. • APS cannot be by TOD operation.

  5. Study Factors to Consider • Potential demand (needs) for APS. • Requests. • Traffic Volumes, and turning movements. • Signal complexity. • Intersection complexity

  6. Potential Demand • High Volume Transit facilities such as Streetcar and LRT stations. • Transit hubs and transfer points. • Libraries or other facilities for the blind. • Recreation facilities.

  7. Requests In Seattle: • Until LINK Light Rail and the South Lake Union Streetcar, almost all of the APS installations were based upon requests. • Almost all requests were to meet transit, shopping, and employment needs of individual(s).

  8. Traffic Volumes • Pedestrians may be present at any time. • Low Volumes. • High turning volume percentage.

  9. Traffic Signal Complexity • Split-Phasing. • Protected Left or Right-Turns. • Leading Pedestrian Intervals (LPI). • Exclusive pedestrian phase. • Other complicated signal operation.

  10. Split Phasing

  11. Intersection Complexity • Skewed intersection geometry. • Median islands. • Free right-turn islands. • Signal complexity. • Intersection complexity

  12. Intersection Skew

  13. Traffic island

  14. APS Design Best Practice

  15. Design Complications • Underground utilities, MH & JB's. • Curb ramps. • Decorative poles. • Light and heavy rail adjacent or in ROW.

  16. Design Complications

  17. Median Island APS

  18. Over-Engineering?

  19. Errors or Design Standards?

  20. Which is Correct?

  21. Office Engineering?

  22. APS in Operation • Actuated operation. • Pre-timed/recall operation. • APS Controller Unit.

  23. Actuated Operation • Pedestrian pushes button to activate. • Audible and vibro-tactile activate with “Walk” indication. • Returns to holding mode with “ Flashing Don't Walk”.

  24. Pre-timed Operation in Seattle • “Walk” interval comes on automatically without the audible & vibro-tactile. • Some devices able to activate audible & vibro-tactile if adequate clearance time. • Returns to holding mode with “ Flashing Don't Walk”, PBS indicator light goes on.

  25. APS Settings • Locator tone is used. • Audible and locator tone volume settings are independently adjustable. • Volume adjusts to ambient noise so as to be quieter at night and other periods.

  26. Noise Complaints • Few complaints regarding audible indications. • Complaints regarding audible mostly by multi-story condo or apartment dwellings. • Many complaints regarding locator tone in residential areas.

  27. APS Prioritization

  28. Post InstallationCheck List

  29. APS Sign Message

  30. Web Resources • NCHRP Web Document 117A, Accessible Pedestrian Signals: A Guide to Best Practices. June 2007 • MUTCD 2009

  31. Questions?

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