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What is the 4-step modeling process?

April 26, 2017modeling process

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What is the 4-step modeling process?

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For the past 40 years, transportation professionals have used a 4-step approach to model transportation demand. After establishing County land use, population, and employment trends, planners determine the following: • Trip generation: An estimate of the number of person trips generated at a particular location, and attracted to a particular location, based on the assumed relationship among socio-economic factors, land use characteristics, and the number of trips. Trip generation then leads to: • Trip distribution An estimate of the number of person trips that originate in every zone in the study area, with destinations to every other zone. The result is a trip table that is used to determine: • Mode Split: An estimate of the number of trips predicted between each origin and destination, expressed by type of mode that is available for that trip. Mode split leads to: • Network assignment: An estimate of the number of trips via a particular mode that will take specific paths through a ro