Samenvatting
Question 2 has been treated in 26 national reports. The rapporteurs have produced an accurate compendium of the national reports and have proceeded to an analysis of the subjects covered. These subjects are as follows: flexible pavement design and the effect of frost; the constituents; road-bases and sub-bases (excluding bituminous mixtures); bituminous mixtures; maintenance; problems of imperviousness to water and bridge surfacings. The journal "revue generale des routes", no 519, april, 1976, page 96-97, contains a summary of the information contained in the 26 national reports. For the covering abstract, see IRRD abstract no 104484.