Abstract
In this study, the road network planning program for the circular forest road network with high-density and various merits was made for forest management. And the forest road network planned by the program and the actual forest road network constructed by a forest owner were compared and examined using index of operational and traffic benefits. The planning method for the main spur road and the branch spur road by the Dijkstra method was examined. The main spur road orthogonal to the contour line to reach the stand was planned along geographic features such as ridges and valleys. The branch spur road along the contour line for operations was planned at regular intervals, formed the circular forest road network. The order of the main spur road planning was changed at random while revenue and expenditure was estimated. Then, the forest road network with large balances was planned. Moreover, the density of road network was adjusted by decreasing the number of attainment points of main spur roads. As a result, the overlap of the operational areas was canceled. The program could make the forest road network with increasing balances per amount of the spur road establishment.
