15 - Chapter7-Intersection LOS

15 - Chapter7-Intersection LOS - Intersection LOS TTE 4004...

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Intersection LOS TTE 4004 10/28/11
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Attendance Quiz Transportation topic for extra credit project A signalized intersection with two phases has a cycle length of 60 seconds. For one traffic movement, the effective green time is found to be 34 seconds and the change interval is found to be 3 seconds. The total lost time is 4 seconds, find the displayed green time.
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Level of Service (LOS) Qualitative measure of how the facility is performing Based on quantitative measurements For intersections: Based on average control delay per vehicle
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Intersection LOS This class will focus on signalized intersections only Other procedures used for other intersection types Two-way stop-controlled All-way stop-controlled Roundabouts
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Introduction Analysis procedure Establish Analysis Lane Groups Calculate Analysis Flow Rates and Adjusted Saturation Flow Rates Calculate Capacities Calculate Delay Determine Level of Service (LOS)
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Lane Groups Similar movements on the same approach placed into a lane group LOS at signalized intersections uses a disaggregate approach Analyzes individual approaches and individual lane groups
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Calculate Analysis Flow Rates Adjust hourly volumes for RTOR Adjust hourly volumes for PHF Assume that these are already accounted for in the textbook problems
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Calculate Adjusted Saturation Flow Rates Start with a base value, usually 1900 pc/hr/ln per the Highway Capacity Manual This value is then adjusted for a variety of roadway and traffic related conditions. Factors such as lane width, grade, heavy vehicle
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15 - Chapter7-Intersection LOS - Intersection LOS TTE 4004...

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