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

Report
This report is an archived publication and may contain dated technical, contact, and link information
Publication Number: FHWA-HRT-04-140
Date: December 2005

Enhanced Night Visibility Series, Volume IX: Phase II—Characterization of Experimental Objects

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LIST OF ACRONYMS AND ABBREVIATIONS


General Terms

ENV Enhanced Night Visibility
IR infrared
VES vision enhancement system
SUV sport utility vehicle
UV–A ultraviolet A (wavelength 315 to 400 nanometers)

Vision Enhancement Systems

HLB halogen (i.e., tungsten-halogen) low beam
hybrid UV–A + HLB hybrid UV–A/visible output together with halogen low beam
three UV–A + HLB three UV–A headlamps together with halogen low beam
five UV–A + HLB five UV–A headlamps together with halogen low beam
HLB–LP halogen low beam at a lower profile
HHB halogen high beam
HOH high output halogen
HID high intensity discharge
hybrid UV–A + HID hybrid UV–A/visible output together with high intensity discharge
three UV–A + HID three UV–A headlamps together with high intensity discharge
five UV–A + HID five UV–A headlamps together with high intensity discharge
IR–TIS infrared thermal imaging system

Objects

BC black-clothed cyclist
BPL black-clothed pedestrian, parallel configuration
BPP black-clothed pedestrian, perpendicular configuration
CB child’s bicycle
TT tire tread
WC white-clothed cyclist
WPL white-clothed pedestrian, parallel configuration
WPP white-clothed pedestrian, perpendicular configuration

Statistical Terms

ANOVA analysis of variance
DF degrees of freedom
F value F-ratio
MS mean square
N number of measurements
P value statistical significance
SS sums of squares

Measurements

delta symbolL luminance difference
delta symbolLth threshold luminance difference
C contrast
cd/m² candela per square meter
ft feet
kPa kilopascals
L luminance
lx lux
m meters
nm nanometers
psi pounds per square inch
s seconds
VL visibility level
µm micrometers

Calculated Variables

AF age factor
FCP negative contrast factor
t observation time
TF time factor
rho symbol reflectivity
E illuminance
beta symbol(theta symbol) angular scattering coefficient
theta symbol angle of observation
dx length of lamina
beta symbol total scattering per unit length

 

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