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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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Detector
A device by which vehicle or pedestrian traffic registers its presence.
The most common detectors are the inductive loop detectors for
vehicles and the push-button detectors for pedestrians.
Downstream
In the direction of the movement of traffic.
Effective Green and Red Times
The movement green and red times for capacity and performance
analysis purposes, which are determined by adjusting the displayed
green and red times for Start Loss and End Gain effects.
Glossary of Road Traffic Analysis Terms
www.aatraffic.com
3
End Gain
Duration of the interval between the end of the displayed green period
and the end of the effective green period for a movement. This is
used in signal timing and performance analysis to allow for additional
departures after the end of green period.
Equivalent Stop Value
Value of a deceleration-acceleration cycle in terms of a major stopstart
cycle. See Major Stop.
Exclusive Pedestrian Phase
The phase at an intersection during which all pedestrian displays are
green and all vehicle displays are red, allowing all pedestrian
movements to operate simultaneously while all vehicle movements
are stopped. Also see Scramble-Crossing Phase.
Exclusive Lane
A lane (or length of lane) allocated for use only by a particular
movement or a type of vehicle, e.g. left-turn lane, through lane, rightturn
lane, bus lane, as opposed to a Shared Lane.
Filter Turn
A turning movement that must give way to and find safe gaps in
conflicting (opposing) vehicle or pedestrian traffic before proceeding,
e.g. filter right-turn, slip-lane left turn, left turn on red. Also see
Opposed Movement.
Fixed-Time Control
A signal control method that allows for only a fixed sequence and
fixed duration of displays.
Flow Rate
Number of vehicles or pedestrians per unit time passing (arriving or
departing) a given reference point.
Flow Ratio
The ratio of arrival (demand) flow rate to saturation flow rate.
Follow-up Headway
The average headway between successive opposed (minor) stream
vehicles entering a gap available in the opposing (major) traffic
stream.
Free-Flow Speed
The uninterrupted traffic speed when density is approximately zero,
i.e. when only few vehicles are present in the traffic stream.
Full Control
Control of a turning movement using three-aspect (red, yellow, green)
turn arrows on a six-aspect signal face, where the green arrow
indicates that the vehicle can turn unopposed (with no opposing
www.aatraffic.com
4 Glossary of Road Traffic Analysis Terms
vehicle or pedestrian traffic) and the red arrow indicates that the
vehicle is not permitted to turn (filter turns not permitted).
Gap Acceptance
The process by which an opposed (minor) stream vehicle accepts an
available gap in the opposing (major) stream for entering (departing
from queue or merging).
Gap Setting
A controller setting equivalent to a predetermined space time
measured between successive vehicles at the given (approach)
speed, detection zone length and vehicle length values that will cause
the signal controller to terminate the green display.
Geometric Delay本新闻共 6页,当前在第 2页 1 2 3 4 5 6 |
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