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...Project report guidelines on the selection and use of road construction materials by transport research laboratory subsector theme t title reference r approvals manager quality reviewed this prepared for infrastructure urban development division iudd department international dfid knowledge program must not be referred to in any publication without permission views expressed are those author s necessarily trl is committed optimising energy efficiency reducing waste promoting recycling re support these environmental goals has been printed recycled paper comprising post consumer manufactured using a tcf totally chlorine free process contents preface introduction general background purpose document strategy scope geological principal rock groups igneous rocks sedimentary metamorphic weathering processes transported situ structure folds discontinuities texture fabric classification characterisation sources hard weak soils residual duricrusts acquisition utilisation information objectives da...