Abstract
We analysed the pattern of a forest road network, with the assumption that the road network may be transformed to a fundamental circuit with the addition of connecting routes from nodes and links of primary dendritic pattern roads. In this paper, an α-index is applied as a parameter to express the formation of a road network, and it is clear that the grade of development of a road network is indicated by this α-index to some extent. Furthermore, the adaptability of utilizing HORTON'S law is studied in the case of a constructed road network which was classified with α-index. As a result, it is cleared that the bifurcation ratio is almost equal in all processes of the development of a road network, and the ratio of road length takes a different value in each area in the primary stage of development, but it is almost made even according to the development.
