The subject of this graduate thesis is the rehabilitation project of D44 state road based data from the measurement of deflections by FWD device. The paper focuses on non-destructive methods of testing the structural condition of pavement constructions based on measured deflections. Such measurements by further processing the data can reveal several facts about the existing state of the built roadway. Various ways of collecting data are presented by measuring and calculating the values from which the state of the roadway is determined. Among the first and simpler ways to determine the structural state was based on the values of the calculated parameters using a falling weight deflectometer (FWD). FWD is one of the most widespread non-destructive measuring devices used to determine the structural condition of pavements. It is widely used in pavement engineering to assess the condition of pavement structures. By measuring with FWD, one of the main aims was to determine the places of reduced load bearing capacity of the road structure on the section Bršćak – Lupoglav, state road D44. Based on the interpreted deflections, available traffic data and data from field research, the pavement structure of the observed section was dimensioned. Taking into account the data on the composition and quality of the material of the pavement structure layers and on the basis of the rehabilitation suggestions, the structural capacity of the repaired pavement structure was checked.