Overview of rules and regulations for road construction and earthworks
The technical regulations pertaining to road construction and traffic are defined by the various committees of the German Road and Transportation Research Association (Forschungsgesellschaft für Straßen- und Verkehrswesen, short FGSV). They provide the recommendation for federal states, which generally adopt these standards. However, variations from state to state are possible, particularly in regard to substitute construction aggregates.
The following FGSV publications form the basis in Germany for the use of recycled aggregates in road construction and earthworks.

Relevant technical regulations for secondary aggregates for use in road construction and earthworks