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Transportation Network Modeling and Calibration by Anam Ardeshiri, Mansoureh Jeihani

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CHAPTER 4

TRAVEL DEMAND MODELING APPROACHES

4.1 FOUR-STEP MODELS

Federal legislations in the 1960s required continuous, comprehensive, and cooperative (3C) urban transportation planning, which led to the four-step models.

The main characteristic of the four-step model is that it compartments the various aspects of travel demand. Because travel demand forecast is too complex to be modeled simultaneously, the four-step model breaks it into several issues and then combines it in a sequential order. The four-step model contains four sequential procedures: trip generation, trip distribution, mode choice, and trip assignment. The inputs of the model are traffic zones, travel surveys, socio-economic and demographic data, and transportation network and ...

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