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Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations

This report is an archived publication and may contain dated technical, contact, and link information
Publication Number: FHWA-HRT-04-133
Date: December 2005

Enhanced Night Visibility, Volume II: Overview of Phase I and Development of Phase II

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ASTM American Society of Testing and Materials
CFAR Center for Applied Research
FHWA Federal Highway Administration
NHTSA National Highway Traffic Safety Administration
TFHRC Turner-Fairbank Highway Research Center
USCAR United States Council for Automotive Research
VDOT Virginia Department of Transportation
VTCTR Virginia Tech Center for Transportation Research
VTRC Virginia Transportation Research Council
VTTI Virginia Tech Transportation Institute

General Terms

ENV Enhanced Night Visibility
GPS global positioning system
HD head-down
HID high intensity discharge
HUD heads-up display
IR infrared
IR–TIS infrared thermal imaging system
ISIS in-vehicle signing information system
SPD spectral power distribution
TCD traffic control device
UV–A ultraviolet A (wavelength 315 to 400 nanometers)
VES vision enhancement system
VMT vehicle miles traveled

Measurements and Scientific Abbreviations

cd candelas
cm centimeters
h hours
H horizontal
Hz Hertz
km kilometers
L luminance
lm lumens
m meters
mi miles
min minutes
mm millimeters
nm nanometers
RA coefficient of retroreflection
RL retroreflected luminance
s seconds
V vertical
W watts


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