IMSA Traffic Signal Technician 2
2025/2026 Exam Questions and
Corresponding Answers with Surety of
100% Pass Mark
In a TS2 cabinet, how many times can the MMU experience a "Port 1 Fail"
in a 24 hour period before
the fault is latched? - 🧠 ANSWER ✔✔1
On a 2070 MMU monitor unit, how does the field tech program allowable
phases? - 🧠 ANSWER ✔✔Remove diode on program card for allowable
phases
On an MMU, is it possible to tape the reset button to prevent the traffic
signal from going into flash? - 🧠 ANSWER ✔✔Yes, it by-passes the conflict
feature and will not flash
On a NEMA CMU program card, how does the signal tech program
allowable phases? - 🧠 ANSWER ✔✔Install copper jumpers and soldering
them on the program card
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
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PRIVACY STATEMENT. ALL RIGHTS RESERVED
,According to best maintenance practices, how often should CMU/MMU be
tested? - 🧠 ANSWER ✔✔Annually
The MMU indicates a RED-FAIL fault on phase 6. Why? - 🧠 ANSWER
✔✔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 - 🧠 ANSWER ✔✔Controller health
When a Technician is recertifying the CMU/MMU at an intersection, what
should the technician do to have the intersection exit flash? - 🧠 ANSWER
✔✔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? - 🧠 ANSWER ✔✔Red Fail
Which of the following can be programmed on an MMU to latch after a fault
occurs? - 🧠 ANSWER ✔✔Field check
How often is an MMU's clock updated from the controller? - 🧠 ANSWER
✔✔Once a second
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
2
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, In a signal cabinet, on the signal monitor, what does a field check indicate?
- 🧠 ANSWER ✔✔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? - 🧠 ANSWER
✔✔NEMA monitors have wire jumpers missing in all positions, the tech
solders the ones in that allow phases to run together.
When the controller timings DO NOT match the timing sheet, who should
be contacted for correct
times? - 🧠 ANSWER ✔✔Traffic Engineer
An older TS1 cabinet experiences a flash condition but the signal heads
are also showing active green, yellow, and red indications. What is the
MOST COMMON issue? - 🧠 ANSWER ✔✔The mercury contactor is stuck
in the normal position.
In a Dual-Ring, 8-phase traffic signal controller, how many phases can run
in each ring at the same
time? - 🧠 ANSWER ✔✔1
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
3
PRIVACY STATEMENT. ALL RIGHTS RESERVED
2025/2026 Exam Questions and
Corresponding Answers with Surety of
100% Pass Mark
In a TS2 cabinet, how many times can the MMU experience a "Port 1 Fail"
in a 24 hour period before
the fault is latched? - 🧠 ANSWER ✔✔1
On a 2070 MMU monitor unit, how does the field tech program allowable
phases? - 🧠 ANSWER ✔✔Remove diode on program card for allowable
phases
On an MMU, is it possible to tape the reset button to prevent the traffic
signal from going into flash? - 🧠 ANSWER ✔✔Yes, it by-passes the conflict
feature and will not flash
On a NEMA CMU program card, how does the signal tech program
allowable phases? - 🧠 ANSWER ✔✔Install copper jumpers and soldering
them on the program card
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
1
PRIVACY STATEMENT. ALL RIGHTS RESERVED
,According to best maintenance practices, how often should CMU/MMU be
tested? - 🧠 ANSWER ✔✔Annually
The MMU indicates a RED-FAIL fault on phase 6. Why? - 🧠 ANSWER
✔✔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 - 🧠 ANSWER ✔✔Controller health
When a Technician is recertifying the CMU/MMU at an intersection, what
should the technician do to have the intersection exit flash? - 🧠 ANSWER
✔✔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? - 🧠 ANSWER ✔✔Red Fail
Which of the following can be programmed on an MMU to latch after a fault
occurs? - 🧠 ANSWER ✔✔Field check
How often is an MMU's clock updated from the controller? - 🧠 ANSWER
✔✔Once a second
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
2
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, In a signal cabinet, on the signal monitor, what does a field check indicate?
- 🧠 ANSWER ✔✔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? - 🧠 ANSWER
✔✔NEMA monitors have wire jumpers missing in all positions, the tech
solders the ones in that allow phases to run together.
When the controller timings DO NOT match the timing sheet, who should
be contacted for correct
times? - 🧠 ANSWER ✔✔Traffic Engineer
An older TS1 cabinet experiences a flash condition but the signal heads
are also showing active green, yellow, and red indications. What is the
MOST COMMON issue? - 🧠 ANSWER ✔✔The mercury contactor is stuck
in the normal position.
In a Dual-Ring, 8-phase traffic signal controller, how many phases can run
in each ring at the same
time? - 🧠 ANSWER ✔✔1
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
3
PRIVACY STATEMENT. ALL RIGHTS RESERVED
