30. GRE noted the slow progress in the work of the Informal Working Group on Visibility, Glare and Levelling (IWG-VGL). To advance the topic, the expert from GTB proposed to bring together various experts on glare and levelling issues for a one-day event, in conjunction with the next session of GRE. GRE supported this idea.

31. GRE took note that WP.29 had extended the mandate of IWG VGL for the year 2018 and recalled its request to IWG VGL to revise its Terms of Reference. The expert from Poland presented his proposals (GRE-79-33). Due to the late availability of GRE-79-33, GRE decided to revert to this issue at the next session. Some experts were of the view that IWG VGL had completed phase I of its mandate and that phase II should be taken over by IWG SLR to avoid duplication in the work of the two IWGs. The Chair invited IWG SLR to address this issue at the next sessions.