The present methodological guide is intended to provide an approach to assessing the environmental acceptability of alternative materials manufactured from waste and intended for road construction usage.
It applies to alternative materials, whose usefulness for road construction applications has been previously justified to ensure that the road does not become a substitute for disposal to landfill.

This methodological guide is mainly intended for civil engineering professionals and industrial organisations wishing to study the possibilities of recycling the waste materials they possess or produce through road construction applications.

In relation to alternative material sources from which experience feedback is convincing, this methodological guide has been broken down into more operational application guides, mainly intended for Prime Contractors, whose aim is to provide a solid reference frame on which technical personnel can base project design or analysis of alternatives proposed within a tender invitation framework.

Reference to the assessment approach provided in this methodological guide is therefore of no help for alternative materials covered by an application guide. In such cases, the instructions given in relevant application guide should be directly followed.

This methodological guide and its associated application guides are wholly embraced by an approach that promotes alternative material usage in road construction under controlled environmental conditions.