WZSC Glossary
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Actuated OperationA type of traffic control signal operation in which some or all signal phases are operated on the basis of actuation. MUTCD 2009 Edition with May 2012 Revisions 1 and 2 | |
ActuationInitiation of a change in or extension of a traffic signal phase through the operation of any type of detector. MUTCD 2009 Edition with May 2012 Revisions 1 and 2 | |
ADA | |
ADAAG | |
ADT | |
ADVANCE FLAGGERAn additional flagger(s), stationed
in advance of the primary flagger, responsible
for warning approaching traffic that traffic is slowed or
stopped ahead and that they need to slow down themselves. The
advance flagger is preceded by
additional flagger signing – see Advance
Flagger detail. The
advance flagger does not stop
traffic, and uses the
SLOW sign paddle only to
get the approaching drivers’ attention. | |
Advance PreemptionThe notification of approaching rail traffic that is forwarded to the highway traffic signal controller unit or assembly by the railroad or light rail transit equipment in advance of the activation of the railroad or light rail transit warning devices. MUTCD 2009 Edition with May 2012 Revisions 1 and 2 | |
Advance Preemption TimeThe period of time that is the difference between the required maximum highway traffic signal preemption time and the activation of the railroad or light rail transit warning devices. MUTCD 2009 Edition with May 2012 Revisions 1 and 2 | |
ADVANCE WARNING AREAAn essential portion of all work zones and
may vary from a series
of signs starting a mile or more in advance of the work space to a single
sign or flashing lights on a
work vehicle. | |
Advisory Speed | |
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