Report on a workshop organized by the Kingdom of the Netherlands on 25 August 2026 in Brussels to address transparency provisions in UN R43. The workshop discussed current transparency requirements, alternative test procedures for reflection, definitions such as chameleon effect, and amendments to working document ECE/TRANS/WP.29/GRSG/2026/20. Participants agreed transparency provisions are not direction-dependent, confirmed the importance of driver visibility, and noted the absence of measurement procedures or objective criteria for reflection levels. The proposal is to add a footnote to clarify requirements for the driver’s forward field of vision, with future evaluation of whether more objective measurement provisions on reflections are needed.