22. GRB was informed that the Working Party on Lighting and Light-Signalling (GRE) had identified the need to introduce definitions for new categories of vehicles into the Consolidated Resolution on the Construction of Vehicles (R.E.3), such as agricultural trailers and towed machinery. GRB noted several alternative proposals for the new definitions (ECE/TRANS/WP.29/GRSG/2014/25 and GRB-60-02) and invited experts to transmit their comments and suggestions, if any, to the secretariat.