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Traffic Signal Timing
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Flashcards
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Pedestrian Clearance Interval
Time for pedestrians to finish crossing
Traffic Signal Timing
Purpose and strategy of coordinated traffic flow
Split Phasing
Dividing signal phases for conflicting movements
Yellow Change Interval
Transition time between green and red phases
Cycle Length (C)
The time for one complete sequence of signal phases
Lead-Lag Phasing
Order of protected left turns in relation to through traffic
Adaptive Signal Control
Dynamic adjustment of signal timings
Signal Preemption
Intervening in normal signal operation for priority
Time of Day Signal Plans
Signal timing schedules based on expected traffic patterns
Signal Priority
Modifying signal timing to benefit specific vehicles
Flash Mode Operations
Use of flashing signal lights during off-peak hours
Lane-Use Control Signals
Signals that indicate which lanes are available for use
Minimum Green Time
Shortest allowable green time for a phase
Vehicle Detection Methods
Techniques to sense vehicles at intersections
Offset
Time difference between the green phases of adjacent signals
Actuated Signal Control
Signal timing changes based on traffic detection
Maximum Green Time
Longest allowable green time for a phase
Phase Sequence
The order of signal phases
Intersection Capacity
Maximum vehicle volume an intersection can handle
Traffic Signal Warrants
Criteria for evaluating the need for traffic control
All-Red Clearance Interval
Brief period when all directions have red signal
Green Split (g/C)
The portion of cycle time allocated to a movement
Coordinated Signal System
Linking traffic signals to operate in a sequence
Pedestrian Walk Interval
Time for pedestrians to begin crossing
Traffic Responsive Plan Selection
Choosing signal timing plans to match current traffic conditions
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