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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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Back of Queue
Maximum extent of the queue relative to the stop line or give-way (yield) line during a signal cycle or gap-acceptance cycle. The last queued vehicle that joins the back of queue is the last vehicle that departs at the end of the saturated part of green interval or the available gap interval.
Capacity
The maximum sustainable flow rate at which vehicles or persons reasonably can be expected to traverse a point or uniform segment of a lane or roadway during a specified time period under given roadway, geometric, traffic, environmental, and control conditions; usually expressed as vehicles per hour, passenger cars per hour, or persons per hour.
Circulating Flow
The vehicle flow rate in all lanes of the circulating road in front of a roundabout entry lane, determined using Stopline Flow Rates.
Critical Gap
The minimum time between successive vehicles in the opposing (major) traffic stream that is acceptable for entry by opposed (minor) stream vehicles.
Cycle-Average Queue
The average queue length that incorporates all queue states including zero queues as counted at regular intervals (e.g. every 5 seconds).
Control Delay
Sum of Stop-Line Delay and Geometric Delay.
Cost (Operating Cost)
A measure that includes the direct vehicle operating cost (the resource cost of fuel and additional running costs including tyre, oil, repair and maintenance as a factor of the cost of fuel) as well as the time cost of vehicle occupants.
Critical Intersection
The intersection in a coordinated signal system that operates with the highest overall degree of saturation during a given period.
Critical Lane
The lane in a lane group or approach that has the highest degree of saturation and places the highest demand on green time. |
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