GTB comments on proposals to restrict lighting options such as band, strip, or illuminated logo. GTB presents findings from a 2025 study by Vrije Universiteit Brussel on daytime running light (DRL) designs, comparing dual and single DRL configurations at different speeds. At 90 km/h no significant difference was found between designs; at 50 km/h dual DRLs showed slightly earlier detection by 30–50 metres (approximately 4 seconds), which researchers considered a perceptual side effect rather than safety-critical. GTB concludes single DRLs provide comparable safety performance to dual DRLs and are viable alternatives. GTB advocates for improved provisions to ensure consistent and harmonised interpretation among Contracting Parties, referencing proposals GRE/2026/6 and GRE/2026/21.

Proposal to amend para. 2.4.10. to define a pair for vehicles of categories M, N and O as one or more lamp(s) extending from left to right-hand side, amend para. 2.4.11. and 2.4.12. to define single and multiple lamps and interdependent lamp systems marked Y, amend para. 5.5. and its sub-paragraphs to establish requirements for paired lamps including symmetry and photometric characteristics, amend para. 5.7.2.2. and 5.7.2.3. to specify installation requirements for single lamps, delete para. 5.7.2.4. concerning positioning and length requirements, amend para. 5.18.2. regarding assembly of lamps marked D, add para. 4.7.3. to UN Regulation No. 148 requiring a pair to contain at least one light source on each side, and amend para. 4.8.1.3. to clarify photometric measurement procedures when lamps use multiple light sources.

Proposal to clarify the definitions of type with regard to manufacturer, trade names and marks.