Term
| Highway Capacity Manual Purpose |
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Definition
provides transportation practitioners and researchers with a
consistent system of techniques for the evaluation of the quality
of service on highway and street facilities |
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Term
| Highway Capacity Manual Objective |
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Definition
| provides a logical set of methods for accessing transportation facilities |
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Term
| Highway Capacity Manual Non Objective |
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Definition
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Term
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Definition
| facilities with no fixed elements to interrupt flow |
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Term
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Definition
| facilities with controlled and uncontrolled access points to interrupt flow |
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Term
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Definition
The capacity of a facility is the maximum hourly rate at
which persons or vehicles reasonably can be expected to
traverse a point or a uniform section of a lane or roadway
during a given time period under prevailing roadway,
traffic, and control conditions. |
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Term
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Definition
| Max hourly rate, persons or vehicles, during a given time period |
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Term
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Definition
a quality measure describing
operational conditions within a traffic stream, generally in
terms of such service measures as speed and travel time,
freedom to maneuver, traffic interruptions, and comfort
and convenience. |
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Term
| Level of Service measures |
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Definition
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Term
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Definition
Free Flow. Speeds unaffected by other vehicles, maneuvers
easily accomplished. |
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Term
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Definition
Near Free Flow. Speeds typically unaffected by other
vehicles, maneuvers relatively easily accomplished |
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Term
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Definition
Slightly Restricted Flow. Speeds occasionally affected by
other vehicles, maneuvers require driver adjustments |
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Term
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Definition
Restricted Flow. Speeds typically dependent on
surrounding vehicles, maneuvers quite difficult. |
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Term
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Definition
Capacity Flow. Speeds dependent on surrounding vehicles,
maneuvers require other vehicles to give way. |
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Term
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Definition
Flow Breakdown. Demand > Capacity, queues result.
Speed varies from stop condition to brisk move-up in queue.
Maneuvers require other vehicles to given way. |
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Term
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Definition
the maximum hourly rate at which persons or vehicles
reasonably can be expected to traverse a point or uniform
segment of a lane or roadway during a given period under
prevailing roadway, traffic, and control conditions while
maintaining a designated level of service |
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Term
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Definition
measures which reflect the
operating conditions of a
facility |
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Term
| Operations Primary Question |
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Definition
| How well is the facility operating? |
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Term
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Definition
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Term
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Definition
| Distance between vehicles |
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Term
| Two way highway service measure |
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Definition
| Average travel speed and Percent time spent following |
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Term
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Definition
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Term
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Definition
| taxiways, aprons, airspace, runways |
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Term
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Definition
| terminals, parking, luggage, gates |
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Term
| Required approach distance |
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Definition
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Term
| Base Saturation Flow Rate |
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Definition
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Term
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Definition
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