International Journal of Roads and Airports (IJRA) ISSN 2036-2595 [on-line] - http://ijra.univpm.it 2–Phase Hyperbolic Models for Urban Traffic Rinaldo M. Colombo 1 , Francesca Ferrari 2 , Mauro Garavello 3♦ , Giulio Maternini 4 1 Dipartimento di Matematica, Università di Brescia, Brescia, Italy 2 Di.C.A.T.A., Università di Brescia, Brescia, Italy 3 Di.S.T.A., Università del Piemonte Orientale, Alessandria, Italy 4 Di.C.A.T.A., Università di Brescia, Brescia, Italy Date received: 30 June 2011 _______________________________________________________________________________________________________________ Abstract. We review different macroscopic models aiming at the description of traffic flows. Their key properties are underlined and compared. Particular emphasis is given to 2–phase mod- els. The extension to networks is also considered. Keywords. 2-Phases Fundamental Diagram; Hyperbolic Traffic Modeling; Macroscopic Traffic Modeling; Urban Traffic Modeling. This work is licensed under the current Creative Commons Attribution-Noncommercial License. ♦ Corresponding Author, mauro.garavello@unimib.it v. 2, n. 1 (2012) 1-12. doi:10.5568/ijra.2012-02-01.112