Safety Aspects of Using Vehicle Hazard Warning Lights: Volume 2. Final Report

Knoblauch, Richard L.; Tobey, Henry N.; BioTechnology, Inc.

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Safety Aspects of Using Vehicle Hazard Warning Lights: Volume 2. Final Report

1980-09-01
By Knoblauch, Richard L. ; Tobey, Henry N.

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English

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Details:

Creators:

Knoblauch, Richard L. ; Tobey, Henry N.

Knoblauch, Richard L. ; Tobey, Henry N. Less -
Corporate Creators:

BioTechnology, Inc.
Contributors:

Warren, Davey ; Byington, Stanley R.

Warren, Davey ; Byington, Stanley R. Less -
Corporate Contributors:

United States. Federal Highway Administration. Traffic Systems Division
Subject/TRT Terms:

[+]

Flares Flashers Slow Moving Vehicles Traffic Incidents Warning Systems
Publication/ Report Number:

FHWA-RD-80-102
Resource Type:

Tech Report
Geographical Coverage:

United States
Edition:

Final Report
Contracting Officer:

Warren, Davey L.; Bynington, Stanley R.
Corporate Publisher:

United States. Federal Highway Administration. Traffic Systems Division
Abstract:

This report describes a series of experiments that were conducted to examine the effectiveness of four-way flashers. Both the disabled vehicle situation and the slow-moving vehicle situation were examined at two- and four-lane locations under both daylight and nighttime conditions. The disabled vehicle tests involved parking a test vehicle (either a car or a tractor-trailer) at the side of the road and monitoring the behavior of drivers. The slow-moving vehicle tests involved introducing a staged slow-moving vehicle (either a car or a tractor-trailer) into the traffic stream and observing the overtaking vehicles. At the disabled vehicle, red and amber four-way flashers as well as flares, reflectorized triangles, headlights, and other situational factors were evaluated. For the slow-moving vehicle tests, the effects of red and amber flashers as well as a 30 and 40 mph (48.3 and 64.4 kph) slow-moving vehicle were examined. For both the disabled and the slow-moving vehicle situations, it was found that four-way flashers are effective at reducing the inherent danger. In the disabled situation, it was found that approaching motorists slow down sooner and slow down more when flashers are displayed. In the slow-moving situation, it was found that drivers of overtaking vehicles approach more cautiously and pass more carefully. In both situations flashers increase the awareness of the drivers of overtaking vehicles.
Format:

PDF
Funding:

DOT-FH-11-9385
Collection(s):

Federal Highway Administration
Main Document Checksum:

[+]

urn:sha256:c0a0973385e45e5d643b2f9e832720fa052aadbfa025aa69e87940a21b16a184
Download URL:

https://rosap.ntl.bts.gov/view/dot/67610/dot_67610_DS1.pdf
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Safety Aspects of Using Vehicle Hazard Warning Lights: Volume 2. Final Report

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