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IMSA Traffic Signal Technician Level II Exam V2 |
(Latest 2025 / 2026 Update) Questions and Verified
Answers | Grade A | 100% Correct
A traffic cycle / ( cycle length ) definition is? 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? American wire gauge Americans with disabilities act of 1990 (ADA) is? 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? Changeable message sign Changeable message sign is for what? 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)? A highway traffic signal with one or more signal sections that operates in a flashing mode. The acronym (ITS) stands for what? Intelligent transportation systems intelligent transportation systems (ITS) what does it do? 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)? The street normally carrying the higher volume of vehicular traffic The acronym (MMU)stands for? Malfunction Management Unit Malfunction management unit is? 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.
Which certification has level II and Level III? 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? Specific assigned timing function in the traffic signal controller. Are phases numbered 1 - 8? True or false? True Even number phases are typically assigned to what movements? Through movements Phases 2-6 are assigned to? Major streets through movements Odd numbers ( 1,3,5,7) phases are assigned to what? Left turn phases
An intersection that has four through phases and four left turn phases are considered how may phases together? Eight phase intersection Each phase is comprised of intervals? True or false? True (Interval )is based on? 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? " 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? 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? "Single-ring" or "dual ring"
Cannot happen at the same time because they conflict with one another ( collide) In a " sequential phases? How many movements can it have? 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_______ Local agency standards What is (traffic signal timing)? 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. Phase intervals phase intervals can be? Green, yellow , red and pedestrian intervals A green interval is? Is the total time assigned to the green indication for a phase whether sequential or concurrent.
Minimum green or initial green time is? 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? 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? 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? 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? 15 to 25 seconds The common meaning for a passage time/ extension time/ gap extension is? 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"?
How is a " yellow change interval calculated? Typically based on the speed of approaching vehicles not the POSTED SPEED LIMIT! "Red Clearance Interval" provides what? A brief period of time between the end of the yellow display on one approach and the start of the green display on a conflicting approach "Basically giving you time to drive to the other side of intersection. Red clearance interval provides a brief period of time. How much time does it give you? 1 to 3seconds How is a red clearance interval calculated? The distance from the stop line to a point that is clear of conflicting vehicles and pedestrians A "pedestrian head "at a intersection gives the pedestrian what information? The time they need to safely cross the street Pedestrian timings include both ________ & _______________? Walk interval and Pedestrian change interval.
What is a "walk interval"? The amount of time that is given to the pedestrian that is using the crosswalk to get to the other side of the crosswalk safely. ( it's not related to the time needed to cross the stree) The MUTCD recommends _____ for the " walk interval " but allows the use of walk intervals as short of ______ seconds? 7 seconds and 4 seconds During the " walk interval" , the " pedestrian signal head" displays what symbol? Steady walking person symbol during the walking interval. " pedestrian clearance time" should be sufficient to allow a pedestrian crossing in the crosswalk at the end of the WALKING PERSON symbol to travel at walking speed of? 3.5 feet per second "Pedestrian clearance time" provides what? enough time for a pedestrian who just enter the crosswalk to reach a safe location at the other end of the crosswalk before a green indication is displayed for other traffic. A pedestrian change interval consisting steps are?
- UPRAISED HAND (symbolizing Don't Walk! ) signal indication shall begin immediately following the WALKING PEROSN (symbolizing walk) signal indication. Following the pedestrian change interval. Consisting of a (steady UPRAISED HAND) symbolizing don't walk signal indication shall be displayed for at least 3 second prior to the release of any coming traffic.
"Maximum recall " is what? Is set for a phase, the controller treats the phase is having a vehicle call at all times "Pedestrian recall" is? Is set for a phase, the controller treat the phase as having a pedestrian call at all times. What "recall "will cause the controller to show a walk signal and pedestrian change interval to the phase every cycle. "Pedestrian recall" Traffic signal coordination timing is? Providing a efficient flow of traffic through multiple intersections, the reduction of stops and delays. What are the basic terms that help "traffic signal coordination"? Cycle length , split , offset , yield point, force-off For coordination to happen, all of the coordinated traffic signals along the street must have the??? Same "cycle length" during the same time of the day The common cycle length at each intersection in the system can change throughout the day why ?
To handle different traffic Volumes, with higher cycle lengths Generally being used during peak hours and shorter cycle lengths being used during off-peak hours What "split " in traffic signal coronation timing? Is the number of seconds given to each phase at the intersection What is the "offset" of a cycle? The number of seconds from the common Signal cycle point, to another point. What are some examples for a "offset point "? End of the green indication. End of mainline green, beginning of mainline green, first green The assessment of different_______ at the various intersections is what causes the intersection to work together. "Offset" What is another point in the cycle of a coordinated traffic signal controller where the major street phase is allowed to end? Yield-point A "force-off" is? A command that forces the Traffic signal controller to end the green display. "Forcing something to change"
What is a "central computer system "? a computer at a centralized location makes decisions and communicates to each individual local controller in the system. The standard traffic signal controller receives commands from where and what happens if communication is lost? Receives commands from central computer, if communication is lost the local controller is forced to revert to its backup plan Communications in Closer loop system typically consist of what? A twisted repair copper cable or fiber optic cable between local controllers and on street masters and than either telephone modems back to the central computer or I some cases cable throughout the system. "Hardwire interconnect" is? The common term for a cable that transmits data between controllers and on street masters or between controllers and central computers Copper cables are terminated in local controller cabinets to an _______? "Interface panel" Standard traffic signal controller receives commands from the? "Center computer system
What is another option that can be used for transmitting and receiving signal system data? Telephone communications "Telephone system" is for what signal system communications "Leased telephone lines" are owned by who? And are assigned to who? Local telephone company and are permanently assigned to and used by the signal system after a contract is negotiated with the telephone company Closed loop systems often use a _________ communication method. "Telephone dial up" "Cell phones" are capable of what? A signal System communications and are a reliable medium in specific areas. The use of "fiber optic cables " provide what? The agency with a much higher capacity for transmission of data What are the advantages of "radio or microwave communication"? Are the cost & they are less expensive to install & lower susceptibility to loss of communications.
Planned ( late night flashing) scheduled (Flashing of a signal that is only needed at a certain times of the day or week ) or emergency (when the conflict monitor send the intersection into flashing) What are two types of "flashing mode operation " Yellow-red flash and red-red flash Where would you put a "red-red flashing mode" where there is a all way stop control. Where every approach has a stop sign. ( 4 way stop ) What are the methods for " preemption and priority "? Providing additional green time for specific movements that require special treatment beyond what the standard operation of the signal provides. Which item is for "higher importance"? Preemption Which item is for "lower importance"? Priority Where would you use a " yellow-red flashing mode"? The yellow in the major-street approaches and red flashing on minor streets
What typical situations are defined as "preemption "? Railroad, drawbridge, and emergency vehicle __________ What situations are defined as "priority "? Movement of buses,light rail, or trolleys in some urban scenarios What are the differences between "preemption & "priority"? The difference is that "preemption "forces off a phase to provide a green indication for the preempted movement & "Priority "typically extends or calls green phase early to service the movement The "bench technician " is responsible for what? For testing and evaluating suspected faulty components using a wide variety of common And specialized pieces of test equipment to make a decision to repair , send to the manufacturer for repair , return to service or replace the item A "laptop computer" can be connected directly to traffic signal controllers and be used for what functions?
- uploading signal system software
- uploading traffic signal timing plans
- video detection set up What is a "multimeter"?
