6. The expert from the Kingdom of the Netherlands introduced document ECE/TRANS/WP.29/GRSG/2026/20 concerning the use of mirror or chameleon type treatments or foils. He explained that an increasing number of vehicles are being fitted, after registration, with so called “privacy” foils on windscreens and front side windows. He highlighted related safety concerns, including reduced eye contact between drivers and other road users and Vulnerable Road Users (VRUs), limited visibility for law enforcement officers of vehicle occupants, and challenges in enforcing rules such as the prohibition of mobile phone use while driving. These issues were compounded by the lack of clarity as to whether existing transparency requirements apply from the exterior to the interior of the vehicle or only from the interior to the exterior.

7. In the absence of agreement among experts, GRSG agreed to retain the proposal (ECE/TRANS/WP.29/GRSG/2026/20) on the agenda of the October 2026 session and endorsed the proposal by the expert from the Kingdom of the Netherlands to organize workshops in the interim to clarify light transmission requirements. Experts from Sweden, OICA, France, Norway, Finland, and the United Kingdom of Great Britain and Northern Ireland supported this initiative and offered their cooperation.