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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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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 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
Delay due to physical and basic traffic control factors as experienced by a vehicle negotiating the intersection in the absence of any other vehicles (due to a deceleration from the approach cruise speed down to an approach negotiation speed, travel at that speed, acceleration to an exit negotiation speed, and then acceleration to the exit cruise speed).
Geometric Stop
The effective value of a slow-down and speed-up manoeuvre associated with Geometric Delay, which is measured in terms of equivalent Major Stops.
Green Time
Duration of the green display for a phase or a movement.
Headway
The time between passage of the front ends of two successive vehicles. See Spacing. |
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