Mass transportation infrastructure projects play an important role in the process of development of urban areas, leading to economic growth and increase of social welfare. Among the various existing types of transit modes is the BRT, which is characterized by being a system that requires a short time of implementation and a low cost of construction, operating in an medium level of operational speed and capacity. In comparison with other transit modes of higher capacity such as trains and subways, the BRT has shown to be a feasible and attractive alternative, as noted by the increasing pace of its implementation in many cities throughout the world in recent years. In this study, an analysis was made of the BRT TransOeste corridor in the city of Rio de Janeiro from the perspective of the Theory of Real Options in order to assess the value of the option of expanding passenger capacity in that corridor. The results suggest that the incorporation of interactive strategies of Real Options related to the decisions of expanding the maximum capacity of passengers and deferring this decision contributed to increase the expected value of the project by 30.63 percent. In addition, the contribution of the granting authority led to an increase in value of the real option.