Abstract
Road pricing systems are designed and realize to reduce the congestion in the urban metropolitan areas. This idea is based on classics economic principles: an increase in the price of a good generally corresponds to a decrease in the demand for that good. In this view, the payment of a toll helps the alignment between supply and demand of mobility. The introduction of road pricing systems imposes to the driver the payment of a toll that finds a correspondence in the external costs that it generates like global warming, gas emission, acoustic pollution, the costs of incident, and the cost of lost time because of traffic jam. The introduction of a road pricing system, moreover, generates an increase in the fiscal pressure. Therefore, the construction of an efficient model of road pricing evaluation must consider, beyond to maximization of the profit (typical of financial approach), also the reduction of the traffic until wished level. The models generally used in these cases are inspired to those used in project finance, while we think its useful combine maximization of financial approach under constrain of maximization of transportation effects.