This paper presents a multi-criteria selection of the best forest road network with the aim of achieving effective preventive and timely repressive protection against forest fires. The research was carried out in national park (NP) "Tara" at a site which is under constant threat of fire. Four variants of the forest road network were designed and analyzed against seven criteria, and the best variant was selected using entropy weight coefficients (EWC) method. The importance of these seven criteria was studied by the management of the NP "Tara." The greatest importance was given to the criteria relating to the cost of construction and maintenance of permanent and temporary roads (47% of the total value of all criteria). The EWC method did not select the variant based on the lowest costs of construction and maintenance as the best option, but the variant whose location was the most suitable for effective defense against forest fires.

This paper presents a new method of symmetric serpentine marking in constructing forest roads on the terrain itself. This method is based on surveying the elements needed for symmetric serpentine marking on forest roads and on estimating other elements and their marking. By using this method construction errors are reduced as well as the number of attempts of serpentine marking on the terrain itself. In the way, the effects of serpentine marking are increased compared to the ones reached by the method used so far

This paper presents a new method of half serpentine marking in constructing forest roads on the terrain itself. This method is based on surveying the elements needed for half serpentine marking on forest roads and on estimating other needed elements and their finished marking. By using this method construction errors are reduced as well as the number of attempts of half serpentine marking. In the way, the effects of half serpentine marking are increased compared to the ones reached by the method used so far

The dependence of the scope of production of the definite forest products (total felling volume, round wood, cordwood, felling waste, waste percentage) in Serbia was analyzed for the period 1991-2000, in relation to the changes of forest road network density. It was concluded that, with the change of forest road network density, the total felling volume, round wood and cordwood decreases, while the quantity of felling waste and its percentage in the total production are not in correlation. This is opposite to the expected which points to the paradox in these relations in the study period

Regulation works in small torrential streams disturb the natural flow regime and the structure of banks and riparian area. The streams are crossed by bridges and culverts. However, at places of low traffic intensity, natural fords are often used for crossing. A regulated ford is constructed by lining and protection of the natural ford, where due to reduced roughness in the ford zone, hydraulic characteristics of the stream show a series of specificities This paper presents the method of calculation of hydraulic factors, which determine the conditions of regulated ford. The construction of regulated ford, as a civil engineering structure, is designed in the conditions enabling a safe traffic at low and medium discharges, while at high water levels there are no obstacles to the flow of water and torrential sediment