Chapter 6 _1_ - Highway Capacity and LOS Concept and...

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Highway Capacity and LOS: Concept and Analysis Procedure Highway capacity and Level of Service (LOS) analyses provide quantitative measurements for roadway performance.
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Important Concepts square4 Highway Capacity square4 Level of Service (LOS) square4 Design traffic volume
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What determines highway capacity?
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Highway LOS square4 Qualitatively reflects the roadway geometry, traffic flow, and operational conditions square4 Ability to pass and ability to absorb disruptions (minor disruptions to severe disruptions)
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Levels of Service circle5 LOS A Free-flow operation circle5 LOS B Reasonably free flow Ability to maneuver is only slightly restricted Effects of minor incidents still easily absorbed From Highway Capacity Manual , 2000
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Levels of Service circle5 LOS C Speeds at or near FFS (free-flow speed) Freedom to maneuver is noticeably restricted Queues may form behind any significant blockage.
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