Prepared by: Vaughan W. Inman Science Applications International Corporation and Gregory W. Davis Federal Highway Administration, RD&T 6300 Georgetown...
Search Results "APS: Accessible Pedestrian Signal"
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Synthesis of Literature Relevant to Roundabout Signalization to Provide Pedestrian Access - Final Report
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Common Problems Arising in the Installation of Accessible Pedestrian Signals
of accessible pedestrian signals (APS)....
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Pushbutton-integrated APS
(See Interfacing Accessible Pedestrian Signals with Traffic Signal Control Equipment.) ...
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Location
Location Pushbutton-integrated APS rely on relative proximity to the crossing location, not on difference in sounds, to clarify which street crossing is being signaled....
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Pushbutton locator tone
locator tone The pushbutton locator tone is a low-volume tick or tone that repeats constantly, at one-second intervals, during the flashing and steady DON’T WALK intervals to advise pedestrians...
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Audible WALK indications
When the pedestrian pushbutton is properly located close to the departure curb, a low-volume WALK signal will be adequate for usability....
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Vibrotactile WALK indications
Vibrotactile WALK indications Vibrotactile indications are transmitted by a vibrating plate or arrow on the housing of the pedestrian pushbutton....
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Tactile arrow
Tactile arrow The tactile arrow on the device must be aligned with the direction of travel on the crosswalk and point toward the street crossing that the pushbutton controls and signals...
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Other Features
a light or beep), tactile crosswalk maps, and options activated by an extended button push: audible beaconing (useful for directional guidance at irregular or long crossings), extended pedestrian...
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Issue 1: APS volume
Modern pushbutton-integrated devices provide the signal right where it is needed -– at the departure curb –- so it needs to provide only a 2-5 dB gain over ambient noise to signal the pedestrian...
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Issue 2: Location relative to the crosswalk
Pedestrians who are blind may stand beside the pushbutton while waiting to cross, particularly if they use the vibrotactile indication....
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Issue 3: Which signal? Speech WALK messages necessary
Issue 3: Which signal?...
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Issue 4: Wrong pole! …Wrong message!
This will allow pedestrians to push the button and then hear the APS at the crosswalk departure point....
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Issue 5: Tactile arrow (in line)
Even small misalignments can inadvertently direct a blind pedestrian outside the crosswalk area or into the parallel traffic. Remedy: The APS needs to be removed and reinstalled....
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Issue 6: Pre-timed signals (an APS is more than a pushbutton)
Issue 6: Pre-timed signals (an APS is more than a pushbutton) Since pedestrians don’t need to use the pushbutton to get a WALK signal at pre-timed signals or where pedestrian signals...
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Issue 7: Repair/replacement (put it back right!)
Issue 7: Repair/replacement (put it back right!) An APS that was knocked down in a crash was reinstalled by workers who did not know how the device was supposed to function. After...
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Issue 8: Rest-in-WALK (quiet time ok)
Issue 8: Rest-in-WALK (quiet time ok) In some locations, the pedestrian signals ‘rest-in-WALK’ and it may not be desirable to have the WALK indication repeat constantly during the long...
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Issue 9: Reach (how far?)
Issue 9: Reach (how far?) APS devices can be located in landscaped areas if the pushbutton is reachable from a level paved area. Figure 12 shows a location where new APS (and new...
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Issue 10: Braille (right side up?)
The typical sign includes print arrows and pedestrian symbols, often on both sides of the sign so that it can be flipped over to be installed on either side of the street....
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Issue 11: Good vibrations (vibrotactile indications)
The vibrotactile indication provides WALK signal information for pedestrians who are both visually and hearing impaired and also may be used by pedestrians who are visually impaired (with...
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Issue 12: Audible beaconing
Research now shows that pedestrians are not able to use the signal for directional information.14 Even with today’s newer technologies, audible beaconing (or a too-loud signal volume)...
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Issue 13: Stub poles
A signal pull box was already in the sidewalk area near the new stub pole location, so concrete work was minimized. Stub poles are commonly used in some jurisdictions. ...
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Issue 14: Inspection of contractor’s work - Beware of field changes!
Figure 22: When two APS are mounted on an existing signal pole, one is poorly located....
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Issue 15: Installation Errors Increase Risk
Eventually, the pedestrian and the DOT signal technicians arranged to meet at the site. Demonstrating the APS, the technician said: “See? The button ticks so you know it’s there....