this report describes a study that has been made of the benefits and disbenefits that have occurred in a number of road projects where waste materials were either used or considered for use as the source of bulk-fill materials. the case studies showed that where waste materials occur in close proximity to a road site their use should be considered because considerable environmental gains can be achieved. however, there is no simple solution to the question as to whether or not waste tips should be used in preference to borrow-pits as the source of bulk-fill material. borrow-pits are not always environmentally harmful and the use of wastes can give rise to problems which may outweigh the benefits of using them. each case must, therefore, be treated on its merits.(a)

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