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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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Pedestrian Minimum Green Time
Minimum time required for both Walk and Flashing Don’t Walk displays, but excluding any overlaps with terminating intergreen displays.
Performance Index
A measure that combines several performance statistics such as delay, number of stops and queue length.
Phase
That part of a signal cycle during which one or more movements receive right of way subject to resolution of any vehicle or pedestrian conflicts by priority rules. A phase is identified by at least one movement gaining right of way at the start of it and at least one movement losing right of way at the end of it.
Phase Sequence
The order of phases in a signal cycle.
Phase Split
Duration of each phase (Green Time and Intergreen Time) within a signal cycle. It is normally expressed as a percentage of cycle length.
Platoon
A group of vehicles or pedestrians travelling together because of signal control, geometric conditions or other factors.
Platoon Ratio
Ratio of the average arrival flow rate during the green period to the average arrival flow rate during the signal cycle.
Practical Degree of Saturation
A target, or maximum, degree of saturation that corresponds to an acceptable level of traffic performance.
Practical Spare Capacity
The amount of increase possible in the demand flow rate to obtain a degree of saturation equal to the practical (target) degree of saturation.
Progression
Progression is a time-relationship, between adjacent traffic signals, which allows vehicle platoons to be given a green signal as they pass through the sequence of intersections.
Progression Factor Method
A simple technique to determine signal coordination effect on delay, queue length, stop rate, etc. where detailed platoon patterns generated at upstream signals are not available. |
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