For forest road construction there are not only federal laws but also state laws (conservation of nature). This different laws restrict road construction in many cases. Particular the state laws change very often. A simple way to design a geotechnical map for problems of forest road constructions is developed and described. This chapter based on geological know and use of geological instruments. Many rules, signatures and figures show, how to interpret the field data sets. All geological facts have to be checked. An example of a geotechnical design of forest roads ends this chapter. Today forest roads are made by a grade line. For the new method the axis must bee measured in the field, especially in the curves. Therefore it is not necessary to calculate contour lines. This simplify the planning part and brings more precision. By changing the elevation of the road surface above or below the terrain the earthwork can be contrlled. Earthwork tables foer bulldozers and excavators are shown. It is possible to vary the parts of fill and cut by combining two tables. So the fill and cut can optimal adapted to the geotechnical needs. The last part is about management of the water on the road surface, the consumption of area for forest roads and computer aided design of forest road projects.
