this report is intended to be a guide to engineers who wish to employ specialist techniques to locate underground services. the tasks may range from checking a whole site for the existence of buried pipes or cables to tracing the routes of services already known to be present. the need for such techniques arises at various stages in road works from the preliminary survey for a new scheme to the maintenance of an old road. the characteristics of the service to be located and the conditions under which this must be done vary widely and few of the devices available fulfil multiple roles. to assist the engineer in choosing the most appropriate equipment, the report includes brief notes on the principles of operation of most types of device and lists a wide range of commercially available instruments together with an indication of the likely applications of each. (a)

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