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OCR for page 97
C H A P T E R 26
Abbreviations*
t Sampling Interval
AADT Average Annual Daily Traffic
AASHTO American Association of State Highway and Transportation Officials
ABS Anti-Lock Braking System
ADA Americans with Disabilities Act
ADT Average Daily Traffic
APS Accessible Pedestrian Signals
ATIS Advanced Traveler Information Systems
ASD Available Sight Distance
cd Candela
CIE Commission Internationale de l'Eclairage
cm Centimeter(s)
CMS Changeable Message Signs
CVO Commercial Vehicle Operations
dBA Sound intensity measured in decibels (relative to sound pressure
level of 20 micropascals). The frequency spectrum is weighted to
approximate human hearing.
DMS Dynamic Message Sign
DSD Decision Sight Distance
DVRE Driver, Vehicle, Roadway, and Environment
EL Edge Line
FARS Fatal Accident Reporting System
FHWA Federal Highway Administration
ft Foot/Feet
g Acceleration/deceleration equivalent to the rate of acceleration due
to gravity. One g equals approximately 9.8 m/s2.
HAR Highway Advisory Radio
HCM Highway Capacity Manual
HFG Human Factors Guidelines for Road Systems
HSM Highway Safety Manual
IA Intersection Angle
IHSDM Interactive Highway Safety Design Model
ISD Intersection Sight Distance
ITE Institute of Transportation Engineers
km/h Kilometers per Hour
LD Legibility Distance
*Covers Chapters 1 through 5, 10, 11, 13, 16 through 20, 22, and 24.
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OCR for page 98
HFG ABBREVIATIONS Version 1.1
LED Light-Emitting Diode
m Meter
mcd Millicandela
MH Metal Halide
mi Mile
mi/h Miles per Hour
mm Millimeter
MMI Most Meaningful Information
MT Maneuver Time
MUTCD Manual on Uniform Traffic Control Devices
NCHRP National Cooperative Highway Research Program
NHTSA National Highway Traffic Safety Administration
NMSL National Maximum Speed Limit
NTOR No Turn on Red
PCC Portland Cement Concrete
PMD Post-Mounted Delineator
POV Principal Other Vehicle
PRT Perception-Reaction Time
PSD Passing Sight Distance
R value Correlation-coefficient
ROW Right-of-Way
RRPM Raised Reflective Pavement Marker
RT Reaction Time
RTOR Right Turn on Red
s or sec Second(s)
SAE Society of Automotive Engineers
SD Sight Distance
SI International System of Units
SLIDE Simplified Location of Information Deficiencies
SR Sampling Rate
SRS Shoulder Rumble Strip
SSD Stopping Sight Distance
SV Subject Vehicle
SVROR Single Vehicle Run off Road
TCD Traffic Control Device
USSC United States Sign Council
UVC Uniform Vehicle Code
v/c Ratio Volume-to-Capacity Ratio
VMS Variable Message Sign
VPD Vehicles per Day
vph Vehicles per Hour
VSL Variable Speed Limit
VTTI Virginia Tech Transportation Institute
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