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| Glossary of Road Traffic Analysis Terms |
| [ 作者： | 来源： | 时间：2006-1-22 13:29:10 ] |
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queue length, stop rate, etc. where detailed platoon patterns
generated at upstream signals are not available.
Proportion Queued
Proportion of traffic that is queued due to the effects of traffic control
and existence of other vehicles. This is related to the Major Stops
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.
www.aatraffic.com
8 Glossary of Road Traffic Analysis Terms
Saturation Flow Rate
The maximum departure (queue discharge) flow rate achieved by
vehicles departing from the queue during the green period at traffic
signals.
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.
Short Lane
A lane of limited length, e.g. a turn bay or part of a lane available
downstream of parked vehicles.
Signalised Crossing
An area of the road used by pedestrians when crossing the road with
the guidance of pedestrian signals at a mid-block or intersection
location, and can be used by cyclists if bicycle signals are provided.
Signal Phasing
Sequential arrangement of separately controlled groups of vehicle
and pedestrian movements within a signal cycle to allow all vehicle
and pedestrian movements to proceed.
Slip Lane
A turning movement lane separated from an adjacent lane by a
triangular island.
Space Length (Gap Distance)
The following distance between two successive vehicles as measured
between the rear end of one vehicle and the front end of the next
vehicle in the same traffic lane (spacing less vehicle length).
Space Time
The time between the detection of two consecutive vehicles when the
presence detection zone is not occupied.
Spacing
The distance between the front ends of two successive vehicles in the
same traffic lane.
Speed
Distance travelled per unit time. In a time-distance diagram, the
slope of the time-distance trace of a vehicle is its speed. Approach
Speed is the uninterrupted (mid-block) cruise speed of vehicles
before being affected by traffic signals. This can be represented by
Glossary of Road Traffic Analysis Terms
www.aatraffic.com
9
the speed limit. Negotiation Speed is the safe speed of a vehicle本新闻共 6页,当前在第 5页 1 2 3 4 5 6 |
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