Human Factors Guidelines for Road Systems: Second Edition (2012) / Chapter Skim
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Pages 302-307
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From page 302... ...
Road User Sampling Rate 4-2 Road User Information Database for Making Decisions 4-3 Where: t = time Δt = sampling interval Sight Distance Stopping Sight Distance (SSD) Design Values 5-4 Where: tRT = perception-reaction time V = design speed, km/h a = deceleration level, m/s2 Where: tRT = perception-reaction time V = design speed, mi/h a = deceleration level, ft/s2 US Customary: 1.075 2 SSD Vt V a RT= +1 47.
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From page 303... ...
HFG EQUATIONS Version 2.0 27-2 Decision Time A t = 3.0 s Metric: Where: 5-8 V = design speed (km/h) a = driver decel.
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From page 304... ...
27-3 HFG EQUATIONS Version 2.0 Metric: a = deceleration, m/s2 (typically 3.1 m/s2) G = gravity @ 9.8 English: a = deceleration, ft/s2 (typically 10 ft/s2)
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From page 305... ...
HFG EQUATIONS Version 2.0 27-4 Contrast Ratio (light-emitting CMS) Where: Luminancemax = luminance emitted by the area or element of greatest intensity (text)
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From page 306... ...
27-5 HFG EQUATIONS Version 2.0 Sight Distance Where: d = required sight distance V = velocity of the vehicle(s) tprt = PRT tman = MT dmanV = distance required to execute a maneuver at velocity V k = a constant to convert the solution to the desired units (feet, meters)
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From page 307... ...
Abbreviations and acronyms used without definitions in TRB publications: AAAE American Association of Airport Executives AASHO American Association of State Highway Officials AASHTO American Association of State Highway and Transportation Officials ACI–NA Airports Council International–North America ACRP Airport Cooperative Research Program ADA Americans with Disabilities Act APTA American Public Transportation Association ASCE American Society of Civil Engineers ASME American Society of Mechanical Engineers ASTM American Society for Testing and Materials ATA Air Transport Association ATA American Trucking Associations CTAA Community Transportation Association of America CTBSSP Commercial Truck and Bus Safety Synthesis Program DHS Department of Homeland Security DOE Department of Energy EPA Environmental Protection Agency FAA Federal Aviation Administration FHWA Federal Highway Administration FMCSA Federal Motor Carrier Safety Administration FRA Federal Railroad Administration FTA Federal Transit Administration HMCRP Hazardous Materials Cooperative Research Program IEEE Institute of Electrical and Electronics Engineers ISTEA Intermodal Surface Transportation Efficiency Act of 1991 ITE Institute of Transportation Engineers NASA National Aeronautics and Space Administration NASAO National Association of State Aviation Officials NCFRP National Cooperative Freight Research Program NCHRP National Cooperative Highway Research Program NHTSA National Highway Traffic Safety Administration NTSB National Transportation Safety Board PHMSA Pipeline and Hazardous Materials Safety Administration RITA Research and Innovative Technology Administration SAE Society of Automotive Engineers SAFETEA-LU Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (2005) TCRP Transit Cooperative Research Program TEA-21 Transportation Equity Act for the 21st Century (1998)
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