ISMA Traffic Signal Technician II
Questions and Answers Latest Version
Already Passed
What is the first step when troubleshooting a non-functioning traffic signal?
✔✔Check the power supply and verify voltage at the controller cabinet.
A signal head is not illuminating. What should the technician inspect first?
✔✔Check the bulb or LED module and ensure proper connection.
How can a technician verify that the signal controller is properly timing the phases?
✔✔Use a timing chart and confirm phase changes match programmed intervals.
What safety equipment should be worn when working on traffic signal poles?
✔✔Hard hat, high-visibility vest, gloves, and safety harness if elevated.
How do you test a pedestrian push button to ensure it is working?
✔✔Press the button and confirm the pedestrian signal initiates the walk phase.
1
,What is the primary function of a traffic signal controller cabinet?
✔✔To house and control the timing and coordination of traffic signals.
When replacing a traffic signal controller, what must be done first?
✔✔Disconnect all power and follow lockout/tagout procedures.
How can a technician detect a faulty detector loop in the pavement?
✔✔Use a loop tester to check for continuity and proper inductance.
What is the recommended method for cleaning traffic signal lenses?
✔✔Use mild detergent and a soft cloth to avoid scratching or damaging lenses.
What should be done if a traffic signal is flashing red in all directions?
✔✔Check for a controller malfunction or power disruption and repair as needed.
How can a technician ensure proper grounding of a traffic signal system?
✔✔Inspect grounding wires and verify continuity to a known ground point.
2
,What is the purpose of an emergency vehicle preemption system?
✔✔To allow traffic signals to change in favor of approaching emergency vehicles.
How do you test a battery backup system for a traffic signal?
✔✔Simulate a power outage and verify the signal operates on battery power.
What tool is used to check the voltage at a signal head or controller?
✔✔A digital multimeter.
How often should traffic signal controllers be inspected for routine maintenance?
✔✔At least twice per year, or as recommended by local guidelines.
What is the main reason for replacing a burnt-out LED module instead of the entire signal head?
✔✔LED modules are modular, more cost-effective, and reduce downtime.
How do you safely work on traffic signal cables in an underground conduit?
✔✔Ensure power is disconnected, use proper PPE, and follow confined space procedures if
applicable.
3
, What is the function of a pedestrian countdown timer?
✔✔To inform pedestrians of the remaining time to cross safely.
How can a technician verify proper coordination between adjacent traffic signals?
✔✔Check timing plans and use a field walk-through or signal monitoring device.
What is the primary hazard when climbing a traffic signal pole?
✔✔Risk of fall, electrocution, or being struck by moving vehicles.
How should a traffic signal technician respond to a reported signal outage?
✔✔Dispatch to the location, assess the problem, and implement corrective action.
What is the correct procedure for splicing traffic signal wires?
✔✔Strip wires, twist or crimp connections, and insulate with approved connectors or tape.
How can a technician identify a malfunctioning vehicle detection camera?
✔✔Check video feed, wiring, and ensure proper lens alignment.
4
Questions and Answers Latest Version
Already Passed
What is the first step when troubleshooting a non-functioning traffic signal?
✔✔Check the power supply and verify voltage at the controller cabinet.
A signal head is not illuminating. What should the technician inspect first?
✔✔Check the bulb or LED module and ensure proper connection.
How can a technician verify that the signal controller is properly timing the phases?
✔✔Use a timing chart and confirm phase changes match programmed intervals.
What safety equipment should be worn when working on traffic signal poles?
✔✔Hard hat, high-visibility vest, gloves, and safety harness if elevated.
How do you test a pedestrian push button to ensure it is working?
✔✔Press the button and confirm the pedestrian signal initiates the walk phase.
1
,What is the primary function of a traffic signal controller cabinet?
✔✔To house and control the timing and coordination of traffic signals.
When replacing a traffic signal controller, what must be done first?
✔✔Disconnect all power and follow lockout/tagout procedures.
How can a technician detect a faulty detector loop in the pavement?
✔✔Use a loop tester to check for continuity and proper inductance.
What is the recommended method for cleaning traffic signal lenses?
✔✔Use mild detergent and a soft cloth to avoid scratching or damaging lenses.
What should be done if a traffic signal is flashing red in all directions?
✔✔Check for a controller malfunction or power disruption and repair as needed.
How can a technician ensure proper grounding of a traffic signal system?
✔✔Inspect grounding wires and verify continuity to a known ground point.
2
,What is the purpose of an emergency vehicle preemption system?
✔✔To allow traffic signals to change in favor of approaching emergency vehicles.
How do you test a battery backup system for a traffic signal?
✔✔Simulate a power outage and verify the signal operates on battery power.
What tool is used to check the voltage at a signal head or controller?
✔✔A digital multimeter.
How often should traffic signal controllers be inspected for routine maintenance?
✔✔At least twice per year, or as recommended by local guidelines.
What is the main reason for replacing a burnt-out LED module instead of the entire signal head?
✔✔LED modules are modular, more cost-effective, and reduce downtime.
How do you safely work on traffic signal cables in an underground conduit?
✔✔Ensure power is disconnected, use proper PPE, and follow confined space procedures if
applicable.
3
, What is the function of a pedestrian countdown timer?
✔✔To inform pedestrians of the remaining time to cross safely.
How can a technician verify proper coordination between adjacent traffic signals?
✔✔Check timing plans and use a field walk-through or signal monitoring device.
What is the primary hazard when climbing a traffic signal pole?
✔✔Risk of fall, electrocution, or being struck by moving vehicles.
How should a traffic signal technician respond to a reported signal outage?
✔✔Dispatch to the location, assess the problem, and implement corrective action.
What is the correct procedure for splicing traffic signal wires?
✔✔Strip wires, twist or crimp connections, and insulate with approved connectors or tape.
How can a technician identify a malfunctioning vehicle detection camera?
✔✔Check video feed, wiring, and ensure proper lens alignment.
4
