WZSC Glossary
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15th percentile speedthe speed at or below which 15 percent of vehicles travel. Also, see Speed distribution. | |
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85th-Percentile SpeedThe speed at or below which 85 percent of the motor vehicles travel. Also, see Speed distribution. MUTCD 2009 Edition with May 2012 Revisions 1 and 2 | |
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AADT | |
AASHTO | |
Acceleration Development RateThe rate at which the centripetal acceleration necessary to negotiate a horizontal curve is developed on the transition segment leading up to the curve. | |
Accessible Pedestrian SignalA device that communicates information about pedestrian signal timing in non-visual format such as audible tones, speech messages, and/or vibrating surfaces. MUTCD 2009 Edition with May 2012 Revisions 1 and 2 | |
Accessible Pedestrian Signal DetectorA device designated to assist the pedestrian who has visual or physical disabilities in activating the pedestrian phase. MUTCD 2009 Edition with May 2012 Revisions 1 and 2 | |
Active Grade Crossing Warning SystemThe flashing-light signals, with or without warning gates, together with the necessary control equipment used to inform road users of the approach or presence of rail traffic at grade crossings. MUTCD 2009 Edition with May 2012 Revisions 1 and 2 | |
ACTIVITY AREA | |
Actual Sight DistanceThe sight distance provided by the highway as designed. | |
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