Journal of Applied Sciences1812-56541812-5662orgz10.3923/jas.2011.647.654D`AciernoLucaGalloMarianoMontellaBruno42011114Urban road networks are generally shared by cars, buses and freight vehicles whose travel times are reciprocally affected (the crossed congestion phenomenon). Hence, simulating performances of urban road networks requires the development of a multimodal assignment model that takes into account the effects of reciprocal influences among vehicles on user travel choices. The proposed model is tested on a real dimension network, adopting three algorithmic approaches (external, internal and hyper-network) for its solution and comparing their performances in terms of computing times and result reliability. Finally, we discuss the effects of crossed congestion on freight path choices and the influences of freight vehicle presence on (road and transit) user choices.]]>Blum, J.R.,1954Cantarella, G.E.,1997Cascetta, E.,2001D'Acierno, L., B. Montella and M. Gallo,2002D'Acierno, L., M. Gallo and B. Montella,2006Dial, R.B.,1971Nguyen, S., S. Pallottino and M. Gendreau,1998Oppenheim, N.,1995Sheffi, Y.,1985