Integrating Feedback into the Transportation Planning Mode
This research develops and applies a new structure for the transportation planning model that includes feedback between demand, assignment, and traffic control. New methods, combined with a renewed interest in transportation planning models prompted by the Clean Air Act of 1990 and the Intermodal Surface Transportation Efficiency Act of 1991, warrant a reconsideration of the traditional "four-step" transportation planning model. This paper presents an algorithm for feedback which results in consistent travel times as input to travel demand and output from route assignment. The model, including six stages of Trip Generation, Destination Choice, Mode Choice, Departure Time Choice, Route Assignment and Intersection Control is briefly outlined. This is followed by an application comparing a base year 1990 application with a forecast year of 2010. The 2010 forecast is solved both with and without feedback for comparison purposes. Incorporation of feedback gives significantly different results than the standard model.
|Date of creation:||1994|
|Date of revision:|
|Publication status:||Published in Transportation Research Record #1413 70-77.|
|Contact details of provider:|| Postal: Dept. of Civil Engineering, 500 Pillsbury Drive SE, Minneapolis, MN 55455|
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Web page: http://nexus.umn.edu
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- Smith, M. J., 1981. "Properties of a traffic control policy which ensure the existence of a traffic equilibrium consistent with the policy," Transportation Research Part B: Methodological, Elsevier, vol. 15(6), pages 453-462, December.
- Smith, M. J., 1981. "The existence of an equilibrium solution to the traffic assignment problem when there are junction interactions," Transportation Research Part B: Methodological, Elsevier, vol. 15(6), pages 443-451, December.
- Smith, M. J., 1979. "Traffic control and route-choice; a simple example," Transportation Research Part B: Methodological, Elsevier, vol. 13(4), pages 289-294, December.
- David Levinson, 1998. "Speed and Delay on Signalized Arterials," Working Papers 199803, University of Minnesota: Nexus Research Group.
- Smith, M. J. & Ghali, M., 1990. "The dynamics of traffic assignment and traffic control: A theoretical study," Transportation Research Part B: Methodological, Elsevier, vol. 24(6), pages 409-422, December.
- Smith, M. J., 1985. "Traffic signals in assignment," Transportation Research Part B: Methodological, Elsevier, vol. 19(2), pages 155-160, April.
- Smith, M. J., 1983. "The existence and calculation of traffic equilibria," Transportation Research Part B: Methodological, Elsevier, vol. 17(4), pages 291-303, August.
- Smith, M. J., 1982. "Junction interactions and monotonicity in traffic assignment," Transportation Research Part B: Methodological, Elsevier, vol. 16(1), pages 1-3, February.
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