Basic_Steps_for_Queuing_Diagrams

# Basic_Steps_for_Queuing_Diagrams - The Basic Steps in...

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The Basic Steps in Building and Reading a Queuing Diagram CE221 – Fundamentals of Transportation Engineering A queuing diagram can be viewed as a plot of cumulative arrivals and cumulative departures over time. The horizontal-axis is time (minutes). The vertical-axis is total vehicles (a count). For each point in time, there are two vehicle totals (two counts) One is a total count of vehicles that have arrived to be serviced. One is a total count of vehicles that have been serviced and have departed. Choose some time to begin counting; where total arrivals = 0 and total departures = 0. Divide the study period into a series of time intervals. For each interval, determine the number of vehicles that arrived in that interval and determine the number of vehicles that departed in that interval. Keep a running total of cumulative arrivals and cumulative departures. When cumulative departures = cumulative arrivals, every vehicle that arrived to be serviced has been serviced and there is no queue. At the end of each time interval; plot a point representing cumulative arrivals and plot a point

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Basic_Steps_for_Queuing_Diagrams - The Basic Steps in...

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