What is the primary purpose of a traffic signal conflict monitor?
Conflict Monitors
Question · Medium
Same battery. Which lets more through?
Short
In NEMA phase numbering, what movements do phases 2 and 6 represent?
Signal Operations & Indications
Flashcard
According to Ohm's Law, if a circuit has a voltage of 120 volts and a resistance of 60 ohms, what is the current?
Basic Electrical Theory
Question · Easy
___ length is the time required for one complete sequence of signal indications.
Signal operations
Guess the Term
Chapter 1: Signal Operations and Indications
1.1 Signal Indications, Colors, and Meanings (MUTCD)
Study guide
Cheat sheet
What does MUTCD stand for?
Mutcd Basics
Read the clue and guess the term in 6 tries.
Game
What is a 'ring' in ring-and-barrier signal controller logic?
What is the standard nominal voltage for traffic signal circuits in the United States?
Signal ___ consists of the right-of-way, yellow change, and red clearance intervals assigned to one movement or a combination of movements.
What type of detector is most commonly installed in the pavement surface at signalized intersections?
Detector Types
What forces both rings of a dual-ring controller to advance to the next phase group together?
In a standard 8-phase signal operation, which phases are typically assigned to the major street through movements?
Signal Phasing
Continuous display of a signal indication for the duration of an interval.
1.2 Phasing, Rings, and Barriers
What is the primary purpose of lockout/tagout (LOTO) procedures in traffic signal maintenance?
Safety Practices
Swap tiles to line up three of the same term.
Term Match
A phase ends because no vehicle was detected within the passage (extension) time. What is this called?
What color is displayed during the pedestrian WALK interval?
Signal Heads And Lenses
Kind of clearance interval that follows the yellow change and precedes the next conflicting green.
What happens at an intersection when the traffic signal controller loses power?
Controller Basics
A phase is cut off at its programmed max green limit despite continuing demand. What is this called?
What is the unit of electrical resistance?
Device in a NEMA TS2 cabinet that detects conflicting signal indications or improper operating voltages and forces a fail-safe mode.
Cabinet components
1.3 Signal Timing Parameters and Controller Modes
A megohm meter (megger) is used to test what property of signal cable?
Question · Hard
Flip two cards at a time to find matching terms.
Term Pairs
What interval typically follows yellow change before the conflicting phase turns green, and why?
What is the function of the load switch in a traffic signal cabinet?
Cabinet Components
Flash transfer ___ moves red or yellow field indications from normal operation to flashing.
Which NEC article primarily addresses grounding and bonding requirements that apply to traffic signal cabinet and equipment installations?
Nec Requirements
What walking speed does the MUTCD use as the default assumption for the pedestrian clearance (flashing don't walk) interval?
What is the purpose of the yellow change interval in a traffic signal cycle?
Signal Timing Fundamentals
Kind of switch that acts as an electrical gate directing voltage to signal heads.
Chapter 2: Cabinet Wiring and Components
2.1 Cabinet Types and Standards
What does a pedestrian pushbutton do when pressed at a signalized intersection?
Find five hidden terms in a grid of letters.
Term Search
A driver sees a steady green ball. Can they legally turn left across oncoming traffic?
In a series circuit with three resistors of 10, 20, and 30 ohms, what is the total resistance?
In a NEMA TS2 cabinet, module that lets the controller communicate with detectors and load switches.
What is the typical color arrangement for a vertical traffic signal head from top to bottom?
What does a Flashing Yellow Arrow (FYA) indicate?
What type of signal preemption system uses optical detectors mounted on or near signal heads?
Signal Preemption Basics
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