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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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GLOSSARY of Road Traffic Analysis Terms
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.
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.
www.aatraffic.com
2 Glossary of Road Traffic Analysis Terms
Critical Movements
The set of movements that determine the capacity and timing
requirements of a signalised intersection.
Cycle
A complete sequence of signal phases.
Cycle Length (Cycle Time)
Time required for one complete sequence of signal displays (sum of
phase green and intergreen times). For a given movement, cycle
time is the sum of the durations of red, yellow and green signal
displays, or sum of Effective Green and Red Times. In gapacceptance
analysis, this is the equivalent average cycle time
corresponding to the block and unblock periods in the opposing traffic
stream.
Degree of Saturation
The ratio of arrival (demand) flow rate to capacity during a given flow
period. Also known as the volume to capacity ratio.
Delay
The additional travel time experienced by a vehicle or pedestrian with
reference to a base travel time (e.g. the free-flow travel time).
Demand Flow (Demand Volume)
The number of vehicles or pedestrians arriving during a given period
as measured at the back of queue (as distinct from departure flows
measured in front of the queue).
Density
The number of vehicles per unit distance along a road segment as
measured at an instant in time.
Design Life
The number of years into the future while the intersection operates
satisfactorily considering increases in traffic demand volumes.本新闻共 6页,当前在第 1页 1 2 3 4 5 6 |
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