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| GLOSSARY of Road Traffic Analysis Terms |
| [ 作者： | 来源： | 时间：2006-1-21 1:28:03 ] |
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Proportion Queued
Proportion of traffic that is queued due to the effects of traffic control and the existence of other vehicles. This is related to the Major Stops or Slow Downs from the approach cruise speed.
Queue
A line of vehicles or pedestrians waiting to proceed through an intersection. Slowly moving vehicles or pedestrians joining the back of the queue are usually considered part of the queue. The internal queue dynamics can involve starts and stops. A faster-moving line of vehicles is often referred to as a moving queue or a platoon. See Back of Queue and Cycle-Average Queue.
Queuing Delay
Part of the Stop-Line Delay that includes the Stopped Delay (while vehicle is idling at near-zero speed) and the Queue Move-up delay (while a queued vehicle accelerates towards the stop-line but stops again, e.g. because the signal display changes to red).
Queue Storage Ratio
The ratio of the queue length to the available queue storage distance.
Red Time
Duration of the red signal display for a phase or a movement.
Saturation Flow Rate
The maximum departure (queue discharge) flow rate achieved by vehicles departing from the queue during the green period at traffic signals. See SCATS Maximum Flow.
SCATS Maximum Flow (MF)
A maximum departure flow rate during a fully saturated green period averaged over the green and intergreen times as a special measure of saturation flow rate. See Saturation Flow Rate.
Scramble-Crossing Phase
An Exclusive Pedestrian Phase at an intersection where pedestrians are allowed to cross in any direction including diagonally within the limits of the crosswalk lines.
Shared Lane
A lane allocated for use by two or more movements, e.g. shared through and right-turn lane, as opposed to an Exclusive Lane. |
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