Pushbutton-integrated APS Figures 1 and 2 show several of the pushbutton-integrated APS devices that are available in the US....
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Pushbutton-integrated APS
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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 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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Synthesis of Literature Relevant to Roundabout Signalization to Provide Pedestrian Access - Final Report
Prepared by: Vaughan W. Inman Science Applications International Corporation and Gregory W. Davis Federal Highway Administration, RD&T 6300 Georgetown...
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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 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....
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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....
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Issue 12: Audible beaconing
from an APS at a ‘porkchop’ island with a channelized right turn lane may lead a pedestrian who is blind to cross the channelized turn lane, thinking it is signalized after hearing the...
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Issue 3: Which signal? Speech WALK messages necessary
Issue 3: Which signal?...
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Audible WALK indications
information that could result in a pedestrian crossing on the wrong signal.4 5 6 7 When two APS must be located closer than 10 feet apart in an alteration where it is infeasible to separate...
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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 14: Inspection of contractor’s work - Beware of field changes!
Figure 21: Orientation and mobility specialist explains the APS to two individuals who will be crossing there (two APS on same pole)....
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Issue 2: Location relative to the crosswalk
Vehicular signal poles are rarely in optimal position for mounting APS pushbuttons....
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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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Issue 11: Good vibrations (vibrotactile indications)
Issue 11: Good vibrations (vibrotactile indications) APS device usability is compromised if the vibrotactile indicator doesn’t vibrate during the WALK....
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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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Issue 10: Braille (right side up?)
Where the APS device includes the street name in Braille, care must be taken to install the signs in the correct location and orientation. ...
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Issue 13: Stub poles
In addition, a fire hydrant is between the crosswalk location (and the curb ramp) and the APS. Figure 16: Stub pole was installed to locate APS near the crosswalk....
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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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Appendix: Checklist for APR Installations
Appendix: Checklist for APR Installations (adapted from “Accessible Pedestrian Signals: A Guide to Best Practice”, NCHRP Web-only document 117A)....
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Other Features
Other Features Most pushbutton-integrated APS can provide additional features....
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Issue 5: Tactile arrow (in line)
Figure 11: APS that was damaged in a crash and temporarily reinstalled with wire....
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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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Issue 9: Reach (how far?)
APS devices can be located in landscaped areas if the pushbutton is reachable from a level paved area....