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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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moving through the controlled area of the intersection. For turning
vehicles, this can be determined as a function of the negotiation
radius. Running Speed is the average speed including the effect of
delays due to interrupted conditions but not including any stopped
(idling) times. Travel Speed is the average speed including the effect
of all delays.
Staged Signalised Crossing
A system by which a long signalised crossing is divided or “staged”
into several time-separated sections, each being a separate group
controlled by individual signals.
Start Loss
Duration of the interval between the start of the displayed green
period and the start of the effective green period for a movement.
This is used in signal timing and performance analysis to allow for
queue discharge time losses at the start of green period due to
vehicles accelerating to saturation speed, or due to giving way to
opposing vehicle or pedestrian movements.
Stop-Line Delay
Delay determined by projecting vehicle time-distance trajectories from
the approach and exit negotiation speeds to the stop line (or give-way
/ yield line), which includes the Queuing Delay and the deceleration
and acceleration delay associated with the negotiation speeds.
Stop Rate
Average number of all acceleration-deceleration manoeuvres
including the queue move-ups, partial stops and geometric stops,
expressed in terms of equivalent Major Stops.
T-Intersection
An intersection where two roads meet (whether or not at right angles)
and one of the roads ends.
Traffic-Actuated Control
A control method that allows a variable sequence and variable
duration of signal displays depending on vehicle and pedestrian traffic
demands.
Traffic Volume
The number of vehicles or pedestrians passing a given point on a
lane or carriageway during a specified period of time.
Total Delay
Sum of delay experienced by all vehicles or pedestrians (vehiclehours
per hour or pedestrian-hours per hour). Obtained as the
product of average delay per vehicle or pedestrian and the flow rate.
10 Glossary of Road Traffic Analysis Terms
Traffic Delay
Delay that results when the interactions between vehicles cause
drivers to reduce speed below the free-flow speed.
Total Travel Distance
Sum of distance travelled by all vehicles (vehicle-kilometres per hour
or vehicle-miles per hour). Obtained as the product of travel distance
per vehicle and the flow rate.
Uninterrupted Flow
A condition in which vehicles travelling in a traffic stream do not have
to stop or slow down for reasons other than those caused by the
presence of other vehicles in that stream.
Unopposed Turn
A left-turn or right-turn movement at a signalised intersection that is
made with no opposing or conflicting vehicular or pedestrian flow
allowed.
Upstream
In the direction opposite to the movement of traffic.
Walk Time
Duration of the Walk display (steady green person) for pedestrians.
Yellow Time
Duration of the yellow display for a phase or a movement.本新闻共 6页,当前在第 6页 1 2 3 4 5 6 |
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