This paper deals with the issue of macroeconomic evaluation of projects regarding the construction of traffic infrastructure and equipment. The objective of traffic infrastructure projects is to ensure the improvement of public welfare and decrease the negative impacts on the environment. Individual projects must be developed properly therefore the particular elements need to be analyzed in detail. In the paper, the evaluation of projects is made on the basis of comparing the costs on construction of the traffic infrastructure with benefits which the construction will bring, i.e. the macroeconomic aspects within the decision-making process regarding the investments need to be quantified on the basis of Cost - Benefit analysis.