22. The expert from the Netherlands presented an update of the project on labelling road surfaces (GRB-67-19), based on the following criteria: skid resistance, noise reduction, rolling resistance and lifespan. GRB recalled its view that labelling road surfaces could only be introduced as a non-legally binding document, e.g. a recommendation or resolution, and its intention to find the most appropriate body to adopt such a document. In this context, the Chair informed GRB about the AC.2 considerations of this issue, at its November 2017 session. The secretariat further reported that the Working Party on Road Transport (SC.1), at its September 2017 session, had indicated that the project was beyond the SC.1 Terms of Reference. The Chair invited the Netherlands, in cooperation with the Chair, secretariat and other interested parties, to draft a recommendation or resolution for consideration at the next session of GRB.