MAINTENANCE AND REHABILITATION OF COUNTY AND LOCAL ROADS OF CENTRAL AREA IN CROATIA

The aim of this paper is to evaluate the needs and optimum strategies for maintenance and rehabilitation of county-level and local roads in the Zagreb area. The authors analyze a 1497-km long road network, which is administered and operated by the Regional Road Administration. The evaluation of the road network condition is based on actual data acquired by field measurements and visual inspection of pavement damage. Deflection measurements (La Croix Deflectograph) and unevenness surveys (profilograph) were conducted on the representative sample of about 5% (75 km) of the total length of the road network under study. The visual inspection of pavement damage on the road network was conducted on the entire regional road network. The strategy of road network maintenance and rehabilitation was analyzed by means of the HDM-4 model. This enabled establishment of technically correct and economically justified strategies of road network maintenance and rehabilitation. In addition, the model enabled definition of time sequence in which individual maintenance and rehabilitation measures are carried out, including the financing requirements.