Title page for ETD etd-08012012-040649


Type of Document Master's Thesis
Author Oliver, Morris Bernard
URN etd-08012012-040649
Title Audible pedestrian signals :a feasibility study
Degree Master of Science
Department Civil Engineering
Advisory Committee
Advisor Name Title
Ardekani, Siamak A. Committee Chair
Steeves, Harrison R. III Committee Member
Walker, Richard D. Committee Member
Keywords
  • Electronic traffic controls
Date of Defense 1989-02-05
Availability restricted
Abstract
This report represents a concentrated effort that

determines the feasibility of audible pedestrian signals.

These signals are devices which give auditory cues to help

the visually impaired cross safely at difficult

intersections. Surveys were sent out to over 100

organizations, audible signal manufacturers, and cities who

have knowledge of the devices, and responses were analyzed.

The devices were found to be feasible but only at certain

complex and confusing intersections. Twelve criteria for

the installation of the devices were developed as were

twelve criteria for the operation of the devices. Buzzers,

constant tones, bird calls, and voice signals were examined

by obtaining information from traffic engineers who had

experience with each sound. It was determined that

intermittent tones were the most effective for human

localization. For the most widely used devices, cost data

were developed for the products, installation, and maintenance. A partial listing of the U.S. and foreign

cities which have the devices was compiled along with a

partial listing of audible signal manufacturers. The

problems the visually impaired face as well as their

suggested solutions are listed. Topics for further study

include the use of hand—held devices which activate sound

signals at intersections and the development of tone schemes

for 4-leg and multi-leg intersections which are not north south

and east—west. An additional topic for future study

is the development of tone schemes for traffic circles.

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