When deciding to carry out a highway project, the economic impact of construction works could often play an important role besides transportation or environmental criteria. Unfortunately, there are few scientific studies about this particular economic aspect of national highway construction. Through this research study, the authors want to set up a relatively simple, feasible and adequate model, which will allow measuring the economic impact of highway constructions. In the first phase, the existing methodology has to be adapted to assess the economic impact. Most appropriate multiplier (economic base, input/output, adopted Keynesian multiplier) has to be selected, before retrieving primary data from middle and large construction firms. Using these data, the multiplier effect of each highway construction type will be determined. Different multipliers will be measured in function of construction work type and the size of the related region.