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IMSA EXAM 2 QUESTIONS AND ANSWERS
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IMSA EXAM 2 QUESTIONS AND ANSWERS
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IMSA EXAM 2 QUESTIONS AND ANSWERSA traffic cycle / ( cycle length ) definition is ? - Answers-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 ? - Answers-American wire gauge
Americans with disabilities act of 1990 (ADA) is ? - Answers-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 ? - Answers-Changeable message sign
Changeable message sign is for what ? - Answers-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 "offset" - Answers-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" - Answers-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"? - Answers-The transfer of normal operation of a traffic
control signal to a special control mode of operation.
What is a "Queue length "? - Answers-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? - Answers-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 ? - Answers-Traffic signal level II bench
Traffic signal level II construction
Traffic signal level II design
Traffic signal level II field
Traffic signal level III Bench
,Traffic signal level III Electrician (field)
(Traffic signal phase )is ? - Answers-Specific assigned timing function in the traffic signal
controller.
Are phases numbered 1 -8 ? True or false ? - Answers-True
Even number phases are typically assigned to what movements? - Answers-Through
movements
Phases 2-6 are assigned to ? - Answers-Major streets through movements
Odd numbers ( 1,3,5,7) phases are assigned to what? - Answers-Left turn phases
An intersection that has four through phases and four left turn phases are considered
how may phases together ? - Answers-Eight phase intersection
Each phase is comprised of intervals ?
True or false ? - Answers-True
(Interval )is based on? - Answers-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? - Answers-" 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? - Answers-A Series of conflicting phases that occur
in simultaneously( same time ) with each other
What is a (Beacon)? - Answers-A highway traffic signal with one or more signal sections
that operates in a flashing mode.
The acronym (ITS) stands for what ? - Answers-Intelligent transportation systems
intelligent transportation systems (ITS) what does it do? - Answers-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) ? - Answers-The street normally carrying the higher volume of
vehicular traffic
The acronym (MMU)stands for ? - Answers-Malfunction Management Unit
,Malfunction management unit is ? - Answers-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? - Answers-That street normally carrying lower volume of
vehicular traffic
What are the two typically ( ring ) that a traffic controller have ? - Answers-"Single-ring"
or "dual ring"
What are other ( rings ) that are rarely used ? And when are these types of rings used
for? - Answers-3 or 4 rings &
(used for two or more separate intersections are controlled by a single controller)
What is a ( barrier) ? - Answers-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? - Answers-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. - Answers-Barriers
What is a ( concurrent phase) ? - Answers-Are movements that happen at the same
time because do not conflict ( collide) with one another.
Example of a ( concurrent phase ) - Answers-A Through movement and a adjacent left
turn movement can move on the same time.
What is a (sequential phase)? - Answers-Cannot happen at the same time because they
conflict with one another ( collide)
In a " sequential phases ? How many movements can it have? - Answers-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_______ -
Answers-Local agency standards
What is (traffic signal timing)? - Answers-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. -
Answers-Phase intervals
, phase intervals can be ? - Answers-Green, yellow , red and pedestrian intervals
A green interval is ? - Answers-Is the total time assigned to the green indication for a
phase whether sequential or concurrent.
Minimum green or initial green time is? - Answers-Is the absolute minimum time that the
green indication must be displayed.
How many basic time components or "sections of time " does a green interval have that
equal the entire interval? - Answers-Three basic time components
Most agencies set a standard for a minimum green initial green time. For a left turn
face. How long should that minimum green be displayed for ? - Answers-3 to 7 seconds
Most agencies set a standard for a minimum green initial green time. For a minor street
through phase. How long should that minimum green be displayed for ? - Answers-5 to
15 seconds
Most agencies set a standard for a minimum green initial green time. For a major street
through phase . How long should that minimum green be displayed for ? - Answers-15
to 25 seconds
The common meaning for a passage time/ extension time/ gap extension is? - Answers-
Is the amount of time when a conflicting call is present that the controller will continue to
Display a green light after the last vehicle has been detected
What is the concept of a "passage time" and "extension time"? - Answers-Making the
time long enough for a vehicle leaving the advance loop to get to a point where It will
continue through the intersection if the light turns yellow
"Gap extension" concept is? - Answers-Making the time equal to the length of time
between vehicles that is high enough so that the green time is no longer being used in
thus it would be better to go to the next phase
Maximum green time is ? - Answers-The highest amount of time that the green light can
be displayed when a Conflicting call is present
How is "maximum green times "for the various phases of the controller calculated ? -
Answers-It's based on traffic volumes
The maximum times can vary during the different portions for a typical day, specially if
the controller as part of an area wide coordinated traffic signal system.. is this passage
true or false? - Answers-True
Yello change interval does what? - Answers-It alerts drivers that the green display has
ended and that the right-of-way will be changing.
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