Chapter 4 - Features of APS

Chapter Summary

This chapter provides a description of APS features, including WALK indications. The features currently available on APS marketed in the U.S. and abroad and their use by pedestrians who are blind or who have low vision are discussed.

Intersection geometry, signalization and installation location can affect the features needed at a particular location to provide adequate unambiguous information to pedestrians who are blind or who have low vision. Poor installation can result in ambiguous WALK information from any APS. More information on designing installations and determining needed features is provided in Chapter 6 and Chapter 7.

APS technology is changing rapidly and additional choices or features may become available. Those making purchasing decisions should consider the background information provided in this chapter when evaluating new technology.

Chapter contents

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