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Some concept of Transportation Engineering are Basic Transportation Model, Classification of Urban Streets, Example of Shock Wave, Geometric Design of Highways, Route Choice, Trip Assignment, Time-Distance Diagrams. Main points of this lecture are: Four Step Model, Transportation Forecasting, Conventional Approach, Trip Generation, Trip Distribution, Mode Choice, Route Assignment, Traffic Analysis Zone, Traffic Generation, Generation Model, Developing Model
Typology: Slides
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Developing and Using the Model
Calibrated Model Relating trip making to socio-economic and land use data
Estimated Target year socio-economic, land use data
Predicted Target year No. of Trips
Survey Base Year Socio-economic, land use And Trip making
Developing and Using the Model
The trip generation model typically can take the form of
No. of trips = Function (pop, income, auto ownership rates)
The model is developed and calibrated using BASE year data
Trip Purpose
Often separate predictions are mode for different type of trips since travel behavior depends on trip purpose
In other words different models must be developed for each trip type
The category of trip types commonly used include
Example of a Trip Generation Model
High Density 0 0.6 2.1 4.6 7.
1 1.5 3.0 5.5 7.
2+ 1.8 3.4 5.9 8.
Low Density 0 1.0 2.5 5.0 7.
1 1.9 3.5 6.0 8.
2+ 2.3 3.9 6.4 9.
Developing and Using the Model
Calibrated Model Relating trip making to socio-economic and land use data
Estimated Target year socio-economic, land use data
Survey Base Year Socio-economic, land use And Trip making
Developing and Using the Model
Calibrated Model Relating trip making to socio-economic and land use data
Estimated Target year socio-economic, land use data
Predicted Target year No. of Trips
Survey Base Year Socio-economic, land use And Trip making
High Density 0 60 420 460 700
1 300 900 1100 790
2+ 180 680 590 1660
Low Density 0 50 250 500 740
1 190 700 600 840
2+ 230 390 640 90
Sources of Uncertainties in Predicting Number of Trips
Modeling Land Use is one Major Source of Uncertainty
What is Predicted?
Trip generation models predict so called TRIP ENDS for each zone
The trip ends maybe classified as either
The two sets of terms sound similar but there is a technical difference
A worker leaves Zone 1 in the morning to go to work in Zone 8
This results in 2 trip ends:
Residential
Non-residential
Residential
Non-residential
When that same worker leaves Zone 8 in the evening to go to home to Zone 1
This results in another 2 trip ends:
Total Number of Trip Ends Zone 1: 2 Trip Ends (1 O, 1 D) Zone 8: 2 Trip Ends (1 O, 1 D)
