Since the 90`s, there has been an increasing participation of the private sector in infrastructure projects in Brazil. This participation, however, took place mainly through traditional concessions, governed by the Concessions Law. However, to become economically viable projects that would not have attractiveness to the private sector due to its high risks, Brazilian government started to analyze some ways to reduce these risks such as the Public Private Partnerships (PPPs), including the term flexibility, traffic guarantee, guarantee of foreign currency risk or even assurance of funding. In this project it`s used the LPVR model (Least Present Value of Revenue) with variable period concession, ally to a minimum traffic guarantee and applying the case to the BR-116/324 highway project through the Real Options Methodology. The results show that the use of this model allows a reduction on the risks both for the government, avoiding excessive gains by the concessionaire, and for the private investor, either for the term flexibility or the guarantee of the traffic granted. So, we can conclude that the LPVR model associated with a minimum traffic guarantee of 80%, increases the VPL in an average of 60%, although this guarantee represents a further cost to the government which is compensated by the increasing attractiveness of the investment to the private sector.