Lecture 17

Lecture 17 - The Pennsylvania State University Department...

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The Pennsylvania State University Department of Civil and Environmental Engineering Lecture 17 – Freeway Level of Service Analysis CE 321: Highway Engineering Fall 2007
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Objectives Define capacity Introduce level of service (LOS) concept Identify base freeway operating conditions Describe basic freeway segment LOS analysis methodology Limitations of methodology
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Capacity Definition The maximum sustainable flow rate at which persons or vehicles can be reasonably expected to traverse a point or uniform segment of a lane or roadway during a given time period under given geometric, traffic, environmental, and control conditions.
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Level of Service Concept Highway Capacity Manual methods Qualitative ranking of performance Motorist perception of service quality: Speed Travel time Maneuverability Convenience
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LOS A Free flow, select speed, excellent comfort / convenience
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LOS B Speeds at or near free-flow, slight decline in freedom/ comfort
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LOS C Speed selection controlled by others, comfort/convenience declines, disruptions can cause significant queuing
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LOS D Restricted maneuverability, reductions in physical and psychological comfort, high density, incidents generate long queues
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LOS E At or near “capacity”, difficult to maneuver, considerable discomfort
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LOS F Breakdown flow, cyclical formation and dissipation of queues, arrivals exceed departures, low operating speeds
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Freeway LOS Methodology Base conditions and capacity Determination of free-flow speed Determination of analysis flow rate Calculate service measure value and LOS
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This note was uploaded on 04/11/2008 for the course C E 321 taught by Professor Pietrucha,martinkeller,michaelwi during the Spring '07 term at Penn State.

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Lecture 17 - The Pennsylvania State University Department...

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