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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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Intergreen Time
Duration of the clearance part of the phase corresponding to the period between the phase change point (the end of running intervals) and the beginning of the green display for the next phase (end of phase). Normally, it comprises Yellow Time and All-Red Time.
Intra-Bunch Headway
Average headway between vehicles in a moving queue (minimum headway in a stream). This is used in order to define moving queues (bunches) of vehicles for the purpose of modelling headway distribution of vehicles.
Lane Group
A set of lanes with one or two shared lanes (e.g. Lane 1: Left-Turn and Through, Lane 2: Through) or a set of exclusive turn lanes (e.g. a single Right-Turn lane).
Lane Utilisation
The distribution of vehicles among lanes when two or more lanes are available for a movement.
Lane Utilisation Ratio
Ratio of the lane degree of saturation to the highest (critical) lane degree of saturation in a Lane Group.
Level of Service
An index of the operational performance of traffic on a given traffic lane, carriageway, road or intersection, based on service measures such as delay, degree of saturation, density and speed during a given flow period.
Major Stop
A drive cycle element that involves a deceleration from the approach cruise speed to zero speed and an acceleration from zero speed to the exit cruise speed.
Occupancy Time
The time that starts when the front of a vehicle enters the detection zone and finishes when the back of the vehicle exits the detection zone, i.e. the duration of the period when the detection zone is occupied by a vehicle.
Off-Peak Period
The periods that have low demand volumes of traffic during the day (24-hour period). |
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