Notes on Transient Queueing Behavior, Capacity Restraint Functions and Their Relationship to Travel Forecasting.

by Martin Wohl

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Capacity restraint functions--which describe travel performance or travel time and delay as a function of the volume using a facility and of the facility capacity--are being used increasingly in the trip distribution and assignment phases of the travel forecasting process. This study discusses the necessity of developing capacity restraint functions for nonsteady-state flows, developing time-of-day capacity restraint and demand functions, and recognizing and dealing with schedule delay in situations where service is infrequent or capacity is restricted. It is concluded that circumstances for nonsteady-state or transient queuing behavior must be included in analyzing performance conditions on travel facilities, and that the quantity of tripmaking to be demanded at any particular time is both time-of-day and travel-service dependent. 22 pp.

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