The Swedish Road Administration's planning process for road building spans from strategic proposal over surveying to the ready road. Geotechnique and material supply are two areas that may have a significant influence on the total cost; these costs are also initially estimated despite the fact that they demand a high level of information to be appraised. In this perspective materials within the construction site become of special interest. Rightly classified and used materials within the construction site have the potential to cost only half of the amount compared to buy materials for a similar use. To classify materials within the construction site and in particular for non-declared materials, two critical points arise:

• Materials within the construction site are to be assessed as fitting for its intended application. The assessment is not correlated to a well defined classifying system and thus the usage of rock materials is biased by personal experience
• Sampling and control of materials shall be done on a ready made construction layer surface.

The material quality control comes late in the building process and may thus be connected to unnecessary high costs of restoration work The risk with the assessment system used for rock materials within the construction site is that the test results from the Nordic Ball mill may get a deciding role at the evaluation.