Human Factors Guidelines for Road Systems: Second Edition (2012) / Chapter Skim
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Pages 286-294
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From page 286... ...
Acceptable Gap Distance -- The size of the gaps in major-road traffic typically accepted by drivers turning from a minor road to provide sufficient time for the minor-road vehicle to accelerate from a stop and complete a turn without unduly interfering with major-road traffic operations. Accessible Pedestrian Signals (APS)
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From page 287... ...
HFG GLOSSARY Version 2.0 24-2 Caution Mode Configuration -- Arrow panel mode C, which provides flashing non-directional information to increase safety near highway work zones by providing early warning information to drivers indicating that caution is required while approaching and traveling through the work zone. Changeable Message Sign (CMS)
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From page 288... ...
devices such as flashing lights, a bell, a "Yield" sign, a "Stop" sign, and/or a descending gate to prevent traffic from crossing the tracks. Decibel (dB)
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Foveal Vision -- Central vision of the eye. The fovea, located in the pit of the retina, is the source of the eye's high visual acuity capability.
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Lag -- The time interval from the point of the observer to the arrival of the front of the next approaching vehicle (Lerner et al., 1995, pp.
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Passing Lane -- A lane added in one or both directions of travel on a two-lane, two-way highway to improve passing opportunities. Passing Sight Distance (PSD)
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ceed, and deflecting the approaching vehicle counter-clockwise around a central island (FHWA, 2009)
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From page 293... ...
affects the perceived color of objects illuminated by it and may affect the ability to detect, identify, or discriminate objects under mesopic lighting conditions. Spectrum -- The full range of wavelengths (colors)
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From page 294... ...
cient safety improvements to justify the expense of installing and operating lighting at the location. Wayside Horn -- An audible warning horn mounted at rail-highway crossings to alert drivers when a train is approaching.
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