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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-04-145
Date: December 2005

Enhanced Night Visibility Series, Volume XIV: Phase III—Study 2: Comparison of Near Infrared, Far Infrared, and Halogen Headlamps on Object Detection in Nighttime Rain

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General Terms

ENV Enhanced Night Visibility
FOV field of view
HHD high head down
IR infrared
SAE Society of Automotive Engineers
SUV sport utility vehicle
VES vision enhancement system

Vision Enhancement Systems

FIR far infrared vision system
HLB halogen (i.e., tungsten-halogen) low beam
NIR near infrared vision system


BlueLF pedestrian, denim clothing, left
BlueRT pedestrian, denim clothing, right
LFtrnLF pedestrian in left turn, left side (denim clothing)
LFtrnRT pedestrian in left turn, right side (denim clothing)
PedDyno dynamic pedestrian
RTtrnLF pedestrian in right turn, left side (denim clothing)
RTtrnRT pedestrian in right turn, right side (denim clothing)

Statistical Terms

ANOVA analysis of variance
DF degrees of freedom
F value F-ratio
MS mean square
P value statistical significance
SE standard error
SNK Student-Newman-Keuls
SS sums of squares


cm/h centimeters per hour
ft feet
ft/s² feet per second squared
inches/hr inches per hour
km kilometers
km/h kilometers per hour
m meters
m/s² meters per second squared
mi/h miles per hour
s seconds

Stopping Distance

BRT braking reaction time
dBD braking distance
f coefficient of friction
g acceleration
G gradient
V velocity


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