The report deals with those wastes which for one reason or another have less potential for use as roadmaking materials than those described in earlier reports in the series. The materials discussed are cement-kiln dust, slate waste, demolition wastes, metallurgical (non-ferrous) slags, waste rubber and waste glass. Freshly produced cement kiln dust has little application in roadmaking but well-weathered material can be used for bulk fill. Slate waste has potential for use as a bulk fill and sub-base material but it is produced in remote areas of the country which limits its application. Demolition waste consisting of crushed brick and unreinforced concrete has high potential for sub-base construction but the amounts available are limited and of spasmodic occurance. Non-ferrous slags, waste rubber and waste glass are considered to have very little potential for use in road construction.