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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. 26-1
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 26-2
