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| Glossary of Road Traffic Analysis Terms |
| [ 作者： | 来源： | 时间：2006-1-22 13:29:10 ] |
|
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.
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 traffic 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).
Glossary of Road Traffic Analysis Terms
www.aatraffic.com
5
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 stop-start cycle 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).
Opposed Movement
A movement (Filter Turn, Permitted Turn, Minor Movement) that gives
way to one or more opposing traffic streams at a signalised or
unsignalised intersection.
Opposing Movement
A movement that conflicts with, and has priority over, another
(opposed) movement.
Overflow
An interrupted traffic condition when a number of queued vehicles are
not able to depart due to insufficient capacity during a traffic signal or
gap-acceptance cycle (also known as cycle failure).
Overflow Queue
Average number of vehicles per cycle left over at the end of green
periods at signals or at the end of acceptable gap (unblock) periods
during gap-acceptance process.本新闻共 6页,当前在第 3页 1 2 3 4 5 6 |
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