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APS home go to front of Accessible Pedestrian Signals
Go to Front page Background section Travel by Blind
Rules & Regulations
Technologies and Features section Types
Walk Indications
Other Features
Choosing and Installing section Where to Install
Designing Installations
New Construction or Reconstruction
Retrofitting an Intersection with an APS
Installation Specifications
Field Adjustments
State of Practices section Case Studies
International Practice
Devices section Manufacturers
Selection Tool
Product Matrix
Downloads section Full Guide
Rating Scales
Field Adjustments

Field Adjustments

The success of Accessible Pedestrian Signal (APS) installations cannot be assured by even the most careful planning. Field adjustments are almost always required to provide the most benefit for all users.

APS products offer a wide variety of standard and optional features, and the technology is changing rapidly. In addition, conditions vary in the field. Intersection and crosswalk geometry may be unusual, traffic control equipment and associated wiring may be old and unable to be adapted as anticipated, and site conditions, including other infrastructure on the corner, may be challenging.

The goal of this section is to inform installers, and those who evaluate this work, of criteria that are critical to the successful performance of APS.


Adjustment of installations
Setting and evaluating sound levels
Installation of speakers and microphones
Installation of pushbuttons, vibrating surfaces, signage and tactile arrows
Follow up on installations


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