Abstract

This paper first proposes a bilevel programming mode to simulataneously estimate O-D matrix and calibrate parameters in link travel time functions from observed link flows under the deterministic user equilibrium condition. It then transforms the non-differetiable bilevel programming model into a continuously differentiable nonlinear programming model by constructing a gap function. Accordingly, the augmented Lagrangian method can be employed to identify the solution of the problem.

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