Accessible Pedestrian Signals Presented by: Joe Couples, P.E. Valerie Lee, P.E.
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Transcript of Accessible Pedestrian Signals Presented by: Joe Couples, P.E. Valerie Lee, P.E.
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Accessible Pedestrian Signals
Presented by:
Joe Couples, P.E.
Valerie Lee, P.E.
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Legacy devices remain...but mostly new technology.
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Seattle APS
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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.
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Study Factors to Consider
• Potential demand (needs) for APS.• Requests.• Traffic Volumes, and turning movements.• Signal complexity.• Intersection complexity
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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.
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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).
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Traffic Volumes
• Pedestrians may be present at any time.• Low Volumes.• High turning volume percentage.
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Traffic Signal Complexity
• Split-Phasing.• Protected Left or Right-Turns.• Leading Pedestrian Intervals (LPI).• Exclusive pedestrian phase.• Other complicated signal operation.
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Split Phasing
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Intersection Complexity
• Skewed intersection geometry.• Median islands.• Free right-turn islands.• Signal complexity.• Intersection complexity
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Intersection Skew
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Traffic island
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APS Design Best Practice
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Design Complications
• Underground utilities, MH & JB's.• Curb ramps.• Decorative poles.• Light and heavy rail adjacent or in ROW.
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Design Complications
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Median Island APS
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Over-Engineering?
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Errors or Design Standards?
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Which is Correct?
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Office Engineering?
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APS in Operation
• Actuated operation.• Pre-timed/recall operation.• APS Controller Unit.
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Actuated Operation
• Pedestrian pushes button to activate.• Audible and vibro-tactile activate with
“Walk” indication.• Returns to holding mode with “ Flashing
Don't Walk”.
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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.
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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.
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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.
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APS Prioritization
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Post InstallationCheck List
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APS Sign Message
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Web Resources
• NCHRP Web Document 117A, Accessible Pedestrian Signals: A Guide to Best Practices. June 2007
• MUTCD 2009
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Questions?