A traffic cycle / ( cycle length ) definition is ? - ANSWER Is the total elapsed Time between the start of a specific display until the display comes up again.
Example ( if the cycle starts at the beginning of a green display it will end when The same green display begins again after the red an...
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A traffic cycle / ( cycle length ) definition is ? - ANSWER Is the total elapsed Time between the start of a
specific display until the display comes up again.
Example ( if the cycle starts at the beginning of a green display it will end when The same green display
begins again after the red and yellow displays have been given.
The acronym AWG stands for what ? - ANSWER American wire gauge
Americans with disabilities act of 1990 (ADA) is ? - ANSWER Requirements ensuring equal opportunity
for persons with disabilities and employment, state and local government services, Public
accommodations, commercial facilities and transportation
The acronym (CMS) stands for what ? - ANSWER Changeable message sign
Changeable message sign is for what ? - ANSWER Also known as variable message sign (VMS) and
dynamic message sign (DMS) CMS are traffic control devices used for traffic warning, regulation, routing
and management, and are designed to affect the behavior of motorist ( thus improve the flow of traffic)
by providing real time highway related information
What is a (Beacon)? - ANSWER A highway traffic signal with one or more signal sections that operates in
a flashing mode.
The acronym (ITS) stands for what ? - ANSWER Intelligent transportation systems
intelligent transportation systems (ITS) what does it do? - ANSWER Improves transportation safety and
mobility and enhances productivity through the use of advanced information and communications
, technologies. ITS encompass a broad range wireless and wire line communications based information
and electronics technologies (ITS)
What is a (major street) ? - ANSWER The street normally carrying the higher volume of vehicular traffic
The acronym (MMU)stands for ? - ANSWER Malfunction Management Unit
Are phases numbered 1 -8 ? True or false ? - ANSWER True
Even number phases are typically assigned to what movements? - ANSWER Through movements
Phases 2-6 are assigned to ? - ANSWER Major streets through movements
Odd numbers ( 1,3,5,7) phases are assigned to what? - ANSWER Left turn phases
An intersection that has four through phases and four left turn phases are considered how may phases
together ? - ANSWER Eight phase intersection
Each phase is comprised of intervals ?
True or false ? - ANSWER True
(Interval )is based on? - ANSWER The amount of TIME that a particular indication is given during a phase
Another words, the total time assigned to a specific display.
An example of an ( interval ) is? - ANSWER " the amount of time that a green indication is given during a
particular phase. " (know as a "green _______ )"
(Ring) in a traffic signal controller is? - ANSWER A Series of conflicting phases that occur in
simultaneously( same time ) with each other
, What are the two typically ( ring ) that a traffic controller have ? - ANSWER "Single-ring" or "dual ring"
What are other ( rings ) that are rarely used ? And when are these types of rings used for? - ANSWER 3 or
4 rings &
(used for two or more separate intersections are controlled by a single controller)
What is a ( barrier) ? - ANSWER Is a boundary point in the preferred sequence. Barrier that separates
something so it won't have in the same time.
How many (barriers) does a "dual ring controller" have? - ANSWER Two , one for leaving the MAJOR
street and one for leaving the MINOR street.
_______ ensure that green indications will not be given to conflicting movement at the intersection at
the same time. - ANSWER Barriers
What is a ( concurrent phase) ? - ANSWER Are movements that happen at the same time because do not
conflict ( collide) with one another.
Example of a ( concurrent phase ) - ANSWER A Through movement and a adjacent left turn movement
can move on the same time.
What is a (sequential phase)? - ANSWER Cannot happen at the same time because they conflict with one
another ( collide)
In a " sequential phases ? How many movements can it have? - ANSWER Only one phase is served at a
time
Traffic signal industry has developed basic standards that provide common terms snd concept , but the
most important thing is to have an understanding of your_______ - ANSWER Local agency standards
What is (traffic signal timing)? - ANSWER The assignment of specific number of seconds for each interval
of each controller timing function.
, ________ are a more detailed assignment of specific portions of time within a phase. - ANSWER Phase
intervals
phase intervals can be ? - ANSWER Green, yellow , red and pedestrian intervals
Malfunction management unit is ? - ANSWER A device used to continually check for the presence of
conflicting signal indications and other malfunctions and to provide an output response to conflict or
malfunction. MMU is an advance type of conflict monitor that also communicates and monitors
controller function.
What is a minor street? - ANSWER That street normally carrying lower volume of vehicular traffic
What is "offset" - ANSWER The time difference, or interval in seconds or percentage of cycle length
between the start of the green indication of the coordinated phase and the system reference signal
What is a "platoon" - ANSWER A group of vehicles or pedestrians traveling together as a group, either
voluntarily or involuntarily, because of traffic signal controls ,geometrical or other factors
What is a "preemption control"? - ANSWER The transfer of normal operation of a traffic control signal to
a special control mode of operation.
What is a "Queue length "? - ANSWER Number of vehicles stopped or slowly moving in a line, where the
movement of each vehicle is constrained by that of the lead vehicle
What is a "signal warrant? - ANSWER A threshold condition that, if found to be satisfied as part of an
engineering study, shall results in analysis of other traffic conditions or factors to determine whether a
traffic control signal or other equipment is justified
Which certification has level II and Level III ? - ANSWER Traffic signal level II bench
Traffic signal level II construction
Traffic signal level II design
Traffic signal level II field
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