tte4004%20Chapter%203%2C124 - 4. Traffic Assignment 4. It...

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4. Traffic Assignment 4. Traffic Assignment 1- Trip Generation It is very important for us to know how many vehicles will use a certain street or highway in order to make decisions related to the geometric design and capacity of this highway. Zone 1 1 2 2 1 Zone 2 2- Trip Distribution 3- Mode Choice 1 2 By car 30% 20% 50% 4-Network Assignment
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Note Note 1- The estimated interzonal person-trips must be translated into vehicular-trips prior to performing the traffic assignment. Car occupancies (i.e., persons per car) vary between cities and also between trip types.
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2- The analysis of a particular transit alternative must address the question of whether a proposed fleet size, operating schedule and the related vehicular frequencies (i.e., flows) provide sufficient capacity to meet the anticipated interzonal person-trip demand.
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3- The highway flows are expressed in vehicles per hour. On the other hand, the estimates of interzonal flows that are obtained by the trip generation-distribution, modal choice sequence are often based on a 24. hr. Period. The demand for transportation exhibits a highly peaked pattern with a sharp peak period in the evening. It is appropriate, therefore to investigate the performance of the transportation system under peak-demand conditions. Typically, the morning peak period demand is in the range of 10 to 20% of the total daily demand.
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4- It is desirable that the assignment of trips retain the direction of these trips . The predominant direction of travel during the morning peak period is toward major activity centers (i.e., CBDs or schools), and the reverse is true during the evening rush hour.
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Route Choice Behavior Route Choice Behavior - It is a key to assigning users on the network. - Wardrop (1952) established two mutually independent principles: 1- Users choose the route that minimizes their own travel time User equilibrium i.e., Each user travel on the shortest path.
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2- Users distribute themselves on the network in such a way that the average travel time for all users is equal (on each
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This note was uploaded on 01/13/2011 for the course CECS Transporta taught by Professor Essamradwan during the Spring '10 term at University of Central Florida.

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tte4004%20Chapter%203%2C124 - 4. Traffic Assignment 4. It...

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