Trip Generation Modeling

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Presentation transcript:

Trip Generation Modeling

Objectives Use terminology Understand Variables Learn growth factoring

Trip Generation Terminology Journey (a.k.a. trip): one-way movement from a point of origin to a point of destination to satisfy the need or demand for activity Home-based (HB) Trip: Home is the origin or destination Non-Home-based (NHB): Neither end of the trip is the home of the traveler Trip Production: Home end of a HB trip or origin end of a NHB trip

Trip Generation Terminology (continued) Trip Attraction: non-home end of the HB trip and the destination end of the NHB trip Trip Generation: total number of trips generated by households in a zone (HB and NHB), where the task remains to allocate NHB to various zones Trip chaining: multiple trips are performed in sequence as a matter of efficiency, performing several activities

Classification of Trips—Trip Purpose Homebased (HB) Work (HBW) School (HBS) Shopping (HBSH) Social and recreation (HBR) Other (HBO) Non-homebased (NHB)not classified into categories

Classification of Trips—Person Type Income level Car ownership Household size Household structure group housing single family-head family-worker

Trip Generation Studies Household based Zonal based

Factors affecting Trip Generation—Personal Trips (Production) income car ownership household structure family size value of land residential density accessibility

Factors affecting Trip Generation—Personal Trips (Attraction) office space commercial space educational space number of employees type of employment (e.g., government, retail, industrial)

Growth Factor Modeling keep it within the context of the variables being forecast Ti = a*X0 + b*X1 Parameters (a = 2.5 trips/hh; b = 6 trips/hh) Variables (X0 = no-auto hh’s; X1 = auto hh’s) Base year X0 = 500 hh and X1 = 500 hh Ti = 4250 trips generated Forecast year everyone will own a car Ti = 8500 trips  based on growth factor 1000/500 = 2 Ti = 6000  based on changes in explanatory variables

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