Cone projection versus half-space projection for the bilevel optimisation of transportation networks

J. Clegg and M. J. Smith

Transportation Research Part B: Methodological, 2001, vol. 35, issue 1, 71-82

Abstract: This paper describes the half-space projection method and cone-projection methods of optimising an urban transportation model. The paper then compares these two methods as applied to seek optimal capacity changes within a very simple example network model. The optimisation has, in each of the cases, a bilevel character since it is performed on two functions; the equilibrium function E (which must have value zero for equilibrium) and the objective function Z which is minimised subject to the constraint that E is zero. Thus E=0 (or 'small') always has priority.

Date: 2001
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