ISMA Traffic Signal Technician II Exam |
Practice Questions and Correct
Answers Rated A+ | 2025/2026 Guide
What three agencies joined together to help develop the 170 controller?
- Correct Answer - California DOT
City of Los Angeles California
New York State DOT
What controller is an open-architecture based general purpose
microcomputer for traffic control? - Correct Answer - Model 170
controller
What two specifications does the model 170 controller require? - Correct
Answer - A specific hardware architecture
A specific processor
How is the Type 179 controller specification similar to the 170
specification?(2) - Correct Answer - Open architecture
Allows for interchangeability of components
,What is the primary difference between the 179 and 170 controller -
Correct Answer - Uses a different microprocessor
Who developed the model 2070 controller? - Correct Answer -
CALTRANS
The 2070 was introduced to supersede which controller? - Correct
Answer - The 170 controller
The minimum green time must be long enough to? - Correct Answer -
Meet drivers expectations as to how long a green interval should be
displayed.
What is the period of time that the signal displays are red for all
approaches? - Correct Answer - All-red clearance
This interval allows for the intersection to "what" before a green phase
starts again? - Correct Answer - Clear
Factors used to determine the most appropriate time for an all red
clearance include: - Correct Answer - Type of vehicular traffic
Driver characteristics
Pedestrian activity in the intersection
,What is the establishment of a definite timing relationship between
adjacent traffic signals? - Correct Answer - Coordination timing
Traffic signal coordination timings are developed to provide a degree of
consistency that should allow traffic to? - Correct Answer - Progress
through a number of intersections without stopping
What within traffic controllers allow for timing plans to transition from one
to another gradually so that traffic is not severely disrupted? - Correct
Answer - Algorithms
The amount of time that is allocated to a particular signal phase is the
phases? - Correct Answer - Split
A split includes what three things associated with the phase? - Correct
Answer - Green time
Yellow time
Red time
What is the transfer of the normal control of signals to a special signal
control mode? - Correct Answer - Preemption timing
Preemption timing has the purpose of servicing? - Correct Answer -
Railroad crossings
, Emergency vehicle passage
Mass transit vehicle passage
Other special tasks
Preemption timing control requires "what" of normal traffic control to
provide the priority needs of a special task? - Correct Answer -
Terminating
Transit preemption is often called what? - Correct Answer - Transit
Priority
Transit priority can operate by two different techniques: - Correct Answer
- Green extension
Red truncation
What has the purpose of transferring the right of way to an emergency
vehicle that needs to traverse an intersection? - Correct Answer -
Emergency vehicle preemption
What are the two types of emergency vehicle preemptions? - Correct
Answer - Stationary
Mobile
Practice Questions and Correct
Answers Rated A+ | 2025/2026 Guide
What three agencies joined together to help develop the 170 controller?
- Correct Answer - California DOT
City of Los Angeles California
New York State DOT
What controller is an open-architecture based general purpose
microcomputer for traffic control? - Correct Answer - Model 170
controller
What two specifications does the model 170 controller require? - Correct
Answer - A specific hardware architecture
A specific processor
How is the Type 179 controller specification similar to the 170
specification?(2) - Correct Answer - Open architecture
Allows for interchangeability of components
,What is the primary difference between the 179 and 170 controller -
Correct Answer - Uses a different microprocessor
Who developed the model 2070 controller? - Correct Answer -
CALTRANS
The 2070 was introduced to supersede which controller? - Correct
Answer - The 170 controller
The minimum green time must be long enough to? - Correct Answer -
Meet drivers expectations as to how long a green interval should be
displayed.
What is the period of time that the signal displays are red for all
approaches? - Correct Answer - All-red clearance
This interval allows for the intersection to "what" before a green phase
starts again? - Correct Answer - Clear
Factors used to determine the most appropriate time for an all red
clearance include: - Correct Answer - Type of vehicular traffic
Driver characteristics
Pedestrian activity in the intersection
,What is the establishment of a definite timing relationship between
adjacent traffic signals? - Correct Answer - Coordination timing
Traffic signal coordination timings are developed to provide a degree of
consistency that should allow traffic to? - Correct Answer - Progress
through a number of intersections without stopping
What within traffic controllers allow for timing plans to transition from one
to another gradually so that traffic is not severely disrupted? - Correct
Answer - Algorithms
The amount of time that is allocated to a particular signal phase is the
phases? - Correct Answer - Split
A split includes what three things associated with the phase? - Correct
Answer - Green time
Yellow time
Red time
What is the transfer of the normal control of signals to a special signal
control mode? - Correct Answer - Preemption timing
Preemption timing has the purpose of servicing? - Correct Answer -
Railroad crossings
, Emergency vehicle passage
Mass transit vehicle passage
Other special tasks
Preemption timing control requires "what" of normal traffic control to
provide the priority needs of a special task? - Correct Answer -
Terminating
Transit preemption is often called what? - Correct Answer - Transit
Priority
Transit priority can operate by two different techniques: - Correct Answer
- Green extension
Red truncation
What has the purpose of transferring the right of way to an emergency
vehicle that needs to traverse an intersection? - Correct Answer -
Emergency vehicle preemption
What are the two types of emergency vehicle preemptions? - Correct
Answer - Stationary
Mobile
