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APS home go to front of Accessible Pedestrian Signals
Go to Front page Background section Travel by Blind
Other Effects of APS
Blind Pedestrians' Access to Complex Intersections
Project 3-62 Guidelines for Accessible Pedestrian Signals
Comparison of two types of APS
Interfacing Accessible Pedestrian Signals (APS) and Traffic Signal Controllers
Wayfinding Technologies for People with Visual Impairments
Comparison of APS signal technologies
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

Current Research:
Blind Pedestrians' Access to Complex Intersections

National Eye Institute of the National Institutes of Health -
Bioengineering Research Partnership

Time frame
June 2000- May 2005

The research study titled Blind Pedestrians' Access to Complex Intersections, a 5-year study that began in June 2000, includes a major task to examine a number of issues related to APS.
    Objectives of APS task:
  • Determine the optimal characteristics of push-button locator and WALK signal tones, compare different APS technologies.
  • Carry out a demonstration project using an optimal APS technology.
  • During the first two years of this project, which have just ended, the focus of the research has been on determining optimal characteristics for the visually impaired traveler with respect to optimal characteristics of tone signals for detection and beaconing in the presence of vehicular noise.
  • Signal strategies to enable correct determination of which crosswalk has the WALK signal and the most positive impact on alignment and veering.
  • Height of the audible signal.
  • Effect of locator tone on crossing accuracy.
Prototype APS technology manufactured by Novax, having the optimal characteristics as determined by testing in years 1 and 2 and part of year 3, will be tested at two intersections in each of four cities several times over a period of the subsequent three years.

Research organizations
Western Michigan University, Vanderbilt University, Boston College, Johns Hopkins, University of North Carolina Highway Safety Research Center

Billie Louise (Beezy) Bentzen
Boston College, Dept. of Psychology
140 Commonwealth Avenue, Chestnut Hill, MA 02467-3807
919-962-8705 - bbentzen@accessforblind.org


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