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Lecture 21 - The Pennsylvania State University Department...

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The Pennsylvania State University Department of Civil and Environmental Engineering Lecture 21 – Trip Generation, Mode Choice and Traffic Assignment CE 321: Highway Engineering Fall 2007
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Travel Demand Introduction Traffic forecasts for new construction Pavement Design Geometric Design (number of lanes, shoulder widths, etc.) Traffic forecasts for operational improvements Estimate effectiveness of alternative improvement projects
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Considerations Overall regional traffic growth/decline Provide sufficient level of service (LOS) Economic factors Traffic-generating activities (work & shopping) Spatial distributions Traffic diversion Network or system effects
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Traveler Decisions Temporal decisions When to travel What time to travel Destination decisions Modal decisions (car, bus, walking, etc.) Spatial or route decisions (origin & destination)
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Traffic Forecasting
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Overview of Traffic Estimation
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Transportation Planning Process Land Use Trip Generation Trip Distribution Modal Split/Choice Auto Occupancy Traffic Assignment/Route Choice
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Land Use Descriptors Character Intensity Location
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Trip Generation The purpose of trip generation estimation is to determine the number of trips to and from activities in an analysis area based on several different factors. Household trips instead of individual trips are modeled.
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Trip Generation Models seek to predict number of trips per hour or per day. Work Trips Shopping Trips Social/Recreational Trips These are considered by the following variables of interest Person trips per household Automobile trips per household Number of home-based work trips Number of home-based non-work (e.g., shopping) trips Number of non-home-based trips
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Trip Generation Models Most trip generation models are of a linear form, where the number of trips made, the dependent variable, is a function of the factors that were mentioned earlier, the independent variables
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Typical Trip Generation Model ki k i i i z b z b z b b T + + + + = ...
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  • Spring '07
  • PIETRUCHA,MARTINKELLER,MICHAELWI
  • Department of Civil and Environmental Engineering, personal travel, Trip generation, UMK

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