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In this paper we consider multi-stages traffic assignment with several demandlayers, user types and network types. We consider two stages: demand matrixcalculation (Entropy Wilson's model) and traffic assignment models (Beckmann orNesterov--de Palma). For the traffic assignment stage we use dual reformulationand combine these stages as a saddle-point problem (convex-concave). Then wediscuss how one can solve this problem numerically.

Sufficient conditions for multi-stages traffic assignment model to be the convex optimization problem