Download IMSA TRAFFIC SIGNAL TECHNICIAN 2 EXAM 2026 UPDATE & VERIFIED ELABORATIONS and more Exams Traffic Control and Regulation in PDF only on Docsity!
IMSA TRAFFIC SIGNAL TECHNICIAN 2 EXAM 2026 UPDATE &
VERIFIED ELABORATIONS
Equations? Length of intersection divided by 3.5 f/s (1m/s) What is the BEST way to observe proper pedestrian push button activation? Walk the intersection and push each button and observe the response According to the NEC(National Electrical Code), GREEN wires in the traffic signal cabinet are only to Be used for Earth ground within the signal cabinet After connecting the phase (2) NB through movement's loops to the vehicle detection board in the traffic signal, what should be verified? That the NB through detection is placing calls on Phase (2) in the controller.
Which observations for failed loop detection will indicate a field problem? A failed continuity test What equipment is NOT used in troubleshooting a video detection system? Lightmeter What happens when a vehicle parks in a detector zone at an intersection using non-intrusive detection? The detection system learns to remove the effect of the parked vehicle. Two adjacent lanes each have loop detectors which are connected to one channel of detection. Observations indicate that vehicles are not being detected in one lane. This could be Caused by A damaged loop connected in parallel. Which of the following terms is used to describe when two loop fields interact with each other in an adverse way? Cross-talking
What is one of the QUICKEST ways to determine if a piece of electrical equipment has been burnt by a short or high voltage? There will be an odor that can be detected What is a MAJOR reason for an AC line filter being installed in a cabinet? To limit damaging effects of transient noise and other interference For the Emergency Vehicle Pre-Emption system, what is the BEST way for the Tech to test the operation of the system? Drive the corridor with a vehicle equipped with an EVP transmitter. What is the importance of track clearance time in a railroad preemption? It provides the time for vehicles to exit the track area prior to the gates being lowered. What is the LAST set of steps a Technician should do after repairing any pedestrian problems?
Document repairs in log book and observe the traffic signal operating for several cycles. Ensure that the pedestrian and vehicle phases are operating per plan. After a Tech has made a modification to a traffic signal, which of the follow is the MOST IMPORTANT To complete? Document in cabinet log book and on signal intersection schematic. While in the field, where would an Tech find information about work that has been performed at a traffic signal intersection? The cabinet log book, located inside traffic signal cabinet. The cabinet has been modified and new detection is added. Where is the MOST appropriate place To note the additions? Add details to the log book noting all the changes Which of the following documents should a technician check when performing controller troubleshooting? Maintenance logs/intersection drawings/timing charts
Make wiring safe. Bag opposite signal display pedestrian phase (6). Document in cabinet log book and work order system. Notify supervisor that they need a pedestrian display assembly and to schedule the installation. After doing any repairs at a traffic signal which of the following is the MOST IMPORTANT to do before leaving the intersection? Observe signal is operating per plans. Which of the following could cause signals at an intersection to repeatedly go into flash? The MMU shows conflict on phases 2, 6, and 4 during the red interval on 2 and 6. The phase 4 field terminal is blackened and the terminal screw is loose A traffic signal head for phase 8 east bound amber is out; the load switch is blown. The Tech checks field terminals in the cabinet with a multimeter and verifies the wire is shorted. Which of the following options describes the MOST LIKELY cause of the shorted wire? Signal cable has rubbed through to bare copper.
A technician is at an intersection with a signal indication that is out. What is the FIRST step the technician should take? Check output voltage in field wiring. A pedestrian phase is not being serviced after the push button is activated. What is the FIRST thing the technician should do? Verify input is received in the controller. The Tech receives a call for a damaged signal head. When arriving on the scene, what is the FIRST thing the technician does? Observe the intersection. The technician arrives at an intersection where all the signals are out. What does the technician do FIRST? Check the line service to make sure there is main power. The technician arrives at an intersection that is dark. What type of meter does the technician use The check voltage? Multimeter
What is required where wires enter the traffic fixtures and/or poles to eliminate wire chaffing? Grommets All wiring not being used should be Attached to ground bar What type of connectors should the tech use when repairing wires underground or in a manhole? Waterproof Which of the following should a Technician look for when performing an inspection on the traffic Signal head? Frayed or damaged wires. What should be inspected during preventative maintenance of concrete traffic signal poles? Pole is free of visual cracks and chips.
During an inspection, a technician discovers a severely chipped or cracked concrete pole. What should the tech do? Document and inform management and/or engineer of damage. When inspecting batteries, which of the following is NOT REQUIRED while performing this task? Ohmmeter. During a pole inspection, it is IMPORTANT to check the pole and foundation for Broken anchor bolts. During scheduled preventative maintenance the Tech observes that the catenary wire is cut next to a street sign on a span wire. What should the tech do? Install a Strandvice inline of catenary wire, and make a note in the work order for management to schedule replacement of catenary wire. After a trouble call, the tech observes that the catenary 9/16" strandvise at the concrete pole is broken. What should the tech do?
What testing device would a tech use to verify continuity of a detector home run cable? Multimeter. What is a way to verify the UPS has been connected and is operating properly? Turn off the main breaker at the electric service disconnect. During inspection of the UPS connected at the traffic signal, the tech notices one of four batteries has expanded and bubbled. What is the recommended response? Test other batteries, and replace the expanded bubbled battery along with other failing batteries. Which of the following MUST be done after changing the UPS batteries? Document initial battery voltages and work done in the traffic signal cabinet log book. What should you do if the signal indications do not function properly after replacing the faulty signals? Review cabinet blueprints to verify the wiring method.
In a NEMA TS1 cabinet, a loop detector provides a call or input to the controller by providing 12 VDC to the controller on the input pin Which statement does NOT include a step to evaluate detection inputs to the controller? Perform a "one-call" to check for any utilities located underground. An approach has four signal heads for the through lanes, three overhead and one on the corner. In a cabinet without load resistors, how many reds have to fail before the CMU/MMU in the cabinet puts the cabinet in flash? 3 Which alternative below presents a correct action to inspect a pedestrian actuation? Use multimeter to verify voltage and continuity of wiring connected to the push button. While visible solder bubbles are acceptable in soldering joints, we should re-solder if there is any soldering leaking through the jumper board. False
On a NEMA CMU program card, how does the signal tech program allowable phases? Install copper jumpers and soldering them on the program card According to best maintenance practices, how often should CMU/MMU be tested? Annually The MMU indicates a RED-FAIL fault on phase 6. Why? The load switch/switch pack produces no outputs. The purpose of the controller CVM (Controller Voltage Monitor) output is to allow the CMU/MMU to Monitor the Controller health When a Technician is recertifying the CMU/MMU at an intersection, what should the technician do to have the intersection exit flash? Replace the CMU/MMU with a newly tested unit
Absence of all colors on a load switch will be indicated by what fault on an MMU or MMU2? Red Fail Which of the following can be programmed on an MMU to latch after a fault occurs? Field check How often is an MMU's clock updated from the controller? Once a second In a signal cabinet, on the signal monitor, what does a field check indicate? The signal indications don't match the controller output for a phase A NEMA CMU/MMU uses a program card to tell the monitor which phases are permitted to run together. Which answer is CORRECT? NEMA monitors have wire jumpers missing in all positions, the tech solders the ones in that allow phases to run together.
As soon as vehicles leave the detection zone of an approach that has met its minimum green time, a signal immediately goes to yellow from the green display. This could be a result of No extension time programmed. What is one reason the phase interval may change even though there is still vehicle demand? Maximum green time has been met A signal tech is reviewing the controller logs and continually sees a cycle fault error. What does that Mean? The CU has not serviced a call in two cycles while in free mode. A coordinated corridor is working well except at one intersection where a platoon of vehicles is being stopped. The MOST LIKELY problem is the Clock has drifted affecting the offset and needs adjusting Observations indicate that right turning vehicles approach the intersection on the side street, stop and then make a right turn on red. When this happens the signals cycle to the side street
even though there are no longer vehicles present in the detection zone. This could be caused by The detection being set to locking detection Of the following, which answer MOST LIKELY would require a controller database be verified to be Correct? When a controller upgrade has been performed Which offset mode is the easiest way to view progression in a coordinated corridor? Beginning of green Why is it important for a Signal Tech to verify that the phase concurrency is the same in the controller as it is in the MMU or ATC CMU? The MMU/CMU will keep the cabinet in flash until MMU mirrors what is programmed in the controller NEMA Standard TS2-2003 requires all but which of these detector faults to be reported to the Controller?
