This paper deals with geotechnic characteristics of groups of soils developed from different lithologies in Castilla y León region (Spain). Data come from a data base previously generated from 22 geotechnic studies of roads. The analyzed groups of soils are: alluvial sediments from little streams which erode granitoids, gneisses and migmatites; alluvial sediments from medium-large rivers (sediments not conditioned by underlying rocks); eluvial soils coming from the weathering of granitoids, gneisses and migmatites; detrital sediments from Tierra de Campos facies; alluvial sediments from little streams in Tierra de Campos facies; eolic sands from Tierra de Pinares facies and miocene marls of Duero basin. The analyses reveal good quality of eluvial soils comming from granitoids, gneisses and migmatites as frame material for road explanades and terraplains, a relatively low plasticity of the detrital sediments of Tierra de Campos facies and a correlation between density and C.B.R. index within differents soils groups. The latter fact allows to obtain indicative C.B.R. index values for future road projects
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