2-6-15 Phasing and Traffic Flow Flashcards
A __?__ is assigned to each movement of controlled traffic.
phase
The sequence of the signal indications and the length of time each signal is on are controlled by the traffic signal __?__.
controller
A __?__ consists of two or more sequentially timed and individually selected conflicting phases that are so arranged as to occur in an established order.
ring
In a four-phase, single-ring controller, phase 1 and phase 3 can be active at the same time.
False
Phases on the same ring are __?__ phases.
conflicting
The timing sequence for a four-phase, single-ring controller is phase 1, then phase 2, then phase 3, then phase 4.
True
A dual-ring controller can control a maximum of __?__ phases.
8
The barrier in a ring diagram is a reference point in the preferred sequence of a multi-ring controller in which all rings are __?__.
interlocked
The rule of the barrier states that all rings must cross the barrier at the same time.
True
The barrier in a ring diagram is also known as a compatibility __?__.
Line
An allowable phase combination with a dual-ring controller is phase 2 and phase 7.
False
According to standard NEMA phasing for an eight-phase intersection, the side street left turn phases are __?__.
phase 3 and phase 7
According to standard NEMA phase rotation, the rotation of the phase orientation counts in a clockwise direction around the intersection.
True
The northbound left turn movement of traffic is always assigned to phase 1.
False
Two phases that are on the same ring can be active and timing at the same time if they are both on the same side of the barrier.
False
The interval for a controller to cycle from any given point in the phase timing to the same point in the phase timing on the next rotation is known as __?__.
cycle length
Pedestrian movements are an extension of vehicle phases.
True
What type of vehicle movement is allowed during the time pedestrians are allowed exclusive movement through an intersection?
no vehicle movement is allowed
Ring diagrams do not apply to pedestrian movement.
False
Standard NEMA phasing assigns odd numbered phases to __?__ movements.
left turn
