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 AbstractThis 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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