Effectiveness of Audible Warning Devices on Emergency Vehicles.

Potter, R. C.; Fidell, S. A.; Myles, M. M.; Keast, D. N.

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Effectiveness of Audible Warning Devices on Emergency Vehicles.

1977-08-01
By Potter, R. C. ; Fidell, S. A. ; Myles, M. M. ; ...

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English

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Creators:

Potter, R. C. ; Fidell, S. A. ; Myles, M. M. ; Keast, D. N.

Potter, R. C. ; Fidell, S. A. ; Myles, M. M. ; Keast, D. N. Less -
Corporate Contributors:

Bolt, Beranek, and Newman, inc.
Subject/TRT Terms:

[+]

Auditory Perception Emergency Vehicles Grade Crossing Protection Systems Highway-railroad Grade Crossing Human Factors Human Factors In Transportation Loudness Noise Sirens Sirens (Signaling Device) Sound Analyzers Sound Level Warning Systems
Publication/ Report Number:

DOT-TSC-OST-77-38 ; PB-274 567

DOT-TSC-OST-77-38 ; PB-274 567 Less -
Resource Type:

Tech Report
Corporate Publisher:

John A. Volpe National Transportation Systems Center (U.S.)
Abstract:

The purpose of the study was to examine the effectiveness of audible warning devices (AWD's) on emergency vehicles in terms of aural detectability. Community noise intrusion and opportunities for AWD optimization were also investigated. Measurements were made of sirens, automobile insertion loss, and human detection performance in real-life and simulated situations. Warning effectiveness distances were calculated for three representative situations: (1) Rural environment with vehicle windows closed and radio on; (2) urban environment with vehicle windows open and radio off; and (3) suburban environment with vehicle windows open and radio off. It was concluded that reliance on present audible warning devices to warn drivers in traffic is not justified. To be loud enough to warn in all ordinary circumstances, the sound level of audible warning devices would have to be increased greatly -- producing intolerable community noise. Present audible warning devices can be improved; more uniform horizontal forward radiation and higher frequency sounds would increase detectability. The analysis procedure can provide the basis for an objective measure of audible warning device performance.
Format:

PDF
Funding:

DOT-TSC-868
Collection(s):

Volpe Center
Main Document Checksum:

[+]

urn:sha256:7f87a070c8fb96b16da655d20ef40883ac32c6ac9eec3dd48f8b67c800814d60
Download URL:

https://rosap.ntl.bts.gov/view/dot/9457/dot_9457_DS1.pdf
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Effectiveness of Audible Warning Devices on Emergency Vehicles.

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