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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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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.
Stopline Flow Rate
Departure flow rate measured at the stop line (or give-way / yield line), which is the same as the demand (arrival) flow rate for undersaturated cases, and is limited to the capacity rate for oversaturated cases. See Demand Flow.
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. |
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