GRVA (based on the tradition of using an acronym from the French “groupe des rapporteurs” and in this case responsible for “vĂ©hicules automatisĂ©s”) was established by WP.29 during its 175th (June 2018) session via a restructuring of the existing Working Parties. As a result, the GRRF (Brakes and Running Gear) was eliminated and certain of its responsibilities (notably tyres and vehicle combination couplings) were transferred to other Working Parties (GRB and GRSG, respectively).
A convenient calendar of GRVA-related meetings (including its subgroups) can be found here.