Travel Demand Model
Estimation and Validation:
Experience from the USA
2013 China User Conference
June 19 - 23
Heejoo Ham, Ph.D
Director of Technical Support
OVERVIEW
Travel Demand Models
Model Calibration & Validation
Additional Information
Travel Demand Models
4
The Basics for Four-Step Model
Trip Generation- Who and Why
Should I Go
−Estimate total trip activity (trip ends) at
each travel analysis zone (TAZ)
Trip Distribution- Where to Go
−Allocate trips between origin and
destination zones
Mode Choice- By What Means to Go
−Allocate trips among the travel modes
(SOV,HOV, Transit)
Assignment- By What Route to Go
−Assign (“load”) trips onto the transportation
networks
5
Standard Four-Step Travel Demand Model
Highway Network Socioeconomic Data Transit Network
Highway Path Building
and Toll Estimation
Trip Generation Transit Path Building
and Fare Estimation
Trip Distribution
Mode Split
Highway Assignment
Transit Assignment
Feedback to Convergence