IMSA TRAFFIC SIGNAL CORE REVIEW QUESTIONS
AND ANSWERS SURE A+
✔✔The following phases are typically assigned to the major street through movements:
- ✔✔2 and 6
✔✔The green interval is made up which three components? - ✔✔Minimum green,
passage time, maximum green
✔✔What are the three types of recall features of a traffic signal controller? -
✔✔Minimum, maximum, pedestrian (+soft)
✔✔In a coordination plan, what is the number of seconds given to each phase at the
intersection? - ✔✔Split (g,y,r)
✔✔Which of the following traffic signal coordination method is typically least expensive?
- ✔✔Time-based coordination
✔✔Which of the following is a definition of cycle length: - ✔✔The elapsed time between
the start of a specific display until that display comes up again
✔✔Which of the following is a characteristic of sequential phases: - ✔✔They cannot
occur at the same time
✔✔Which of the following is a definition for initial green time: - ✔✔Minimum time that
the green indication must be displayed
✔✔The only point in the cycle of a coordinated traffic signal controller where the major-
street phase is allowed to end is called: - ✔✔Yield point
, ✔✔Which of the following is NOT a common mode of operation for timing plans in a
signal system: - ✔✔Y: Time of day
N: Traffic related
Y: Traffic Responsive
Y: Traffic adaptive
✔✔Two common terms to describe traffic signal supports and signal heads are: -
✔✔Rigid and free-swinging
✔✔In a single wire with a single point attachment configuration, the wire that supports
the signal head is called the: - ✔✔Messenger wire
✔✔The two nominal diameter sizes for vehicular signal lenses are: - ✔✔8 in (200 mm)
and 12 in (300 mm)
✔✔The purpose for "louvers" is to: - ✔✔Make signal visible from a specific lane
✔✔Which of the following types of conduit are used for traffic signals? - ✔✔Rigid Steel
Conduit
High-Density Polyethylene (HDPE)
PVC Schedule 40
✔✔Traffic signal supports are NOT used to display the following items: - ✔✔Y: Guide
signs
N: Advertisements
Y: Regulatory signs
Y: Overhead street sign names
✔✔Which of the following is a disadvantage of mast arms: - ✔✔Large foundations
✔✔Methods of signal supports include all of these except: - ✔✔N: Arched supports
Y: Truss supports
Y: Monotube supports
Y: Pedestal supports
✔✔Components of the optical unit for an incandescent lamp include all of the following
except: - ✔✔Y: Lamp socket
N: Shade
Y: Lens
Y: Reflector
✔✔For pedestrian signals controlling crosswalks less than 100 feet, what is the required
height of the symbols themselves: - ✔✔At least 6 inches
AND ANSWERS SURE A+
✔✔The following phases are typically assigned to the major street through movements:
- ✔✔2 and 6
✔✔The green interval is made up which three components? - ✔✔Minimum green,
passage time, maximum green
✔✔What are the three types of recall features of a traffic signal controller? -
✔✔Minimum, maximum, pedestrian (+soft)
✔✔In a coordination plan, what is the number of seconds given to each phase at the
intersection? - ✔✔Split (g,y,r)
✔✔Which of the following traffic signal coordination method is typically least expensive?
- ✔✔Time-based coordination
✔✔Which of the following is a definition of cycle length: - ✔✔The elapsed time between
the start of a specific display until that display comes up again
✔✔Which of the following is a characteristic of sequential phases: - ✔✔They cannot
occur at the same time
✔✔Which of the following is a definition for initial green time: - ✔✔Minimum time that
the green indication must be displayed
✔✔The only point in the cycle of a coordinated traffic signal controller where the major-
street phase is allowed to end is called: - ✔✔Yield point
, ✔✔Which of the following is NOT a common mode of operation for timing plans in a
signal system: - ✔✔Y: Time of day
N: Traffic related
Y: Traffic Responsive
Y: Traffic adaptive
✔✔Two common terms to describe traffic signal supports and signal heads are: -
✔✔Rigid and free-swinging
✔✔In a single wire with a single point attachment configuration, the wire that supports
the signal head is called the: - ✔✔Messenger wire
✔✔The two nominal diameter sizes for vehicular signal lenses are: - ✔✔8 in (200 mm)
and 12 in (300 mm)
✔✔The purpose for "louvers" is to: - ✔✔Make signal visible from a specific lane
✔✔Which of the following types of conduit are used for traffic signals? - ✔✔Rigid Steel
Conduit
High-Density Polyethylene (HDPE)
PVC Schedule 40
✔✔Traffic signal supports are NOT used to display the following items: - ✔✔Y: Guide
signs
N: Advertisements
Y: Regulatory signs
Y: Overhead street sign names
✔✔Which of the following is a disadvantage of mast arms: - ✔✔Large foundations
✔✔Methods of signal supports include all of these except: - ✔✔N: Arched supports
Y: Truss supports
Y: Monotube supports
Y: Pedestal supports
✔✔Components of the optical unit for an incandescent lamp include all of the following
except: - ✔✔Y: Lamp socket
N: Shade
Y: Lens
Y: Reflector
✔✔For pedestrian signals controlling crosswalks less than 100 feet, what is the required
height of the symbols themselves: - ✔✔At least 6 inches
