Proposal of Amendment 1 to UN GTR No. 16 to include new provisions on wet grip performance, rolling resistance, and qualification of tires for use in severe snow conditions for passenger cars and light trucks/commercial vehicles. The amendment also reflects recent changes adopted in US Federal Motor Vehicle Safety Standards (tire strength and tubeless tire bead unseating resistance) and UN Regulations Nos. 30 and 54.

Proposal for the explanatory report detailing the decisions and rationale involved in the development of Amendment 1 to the GTR on passenger and light truck/commercial vehicle tires.

Proposal to develop amendments to Part II of GTR No.16:

1. Addition of new definitions (Section 2);
2. Harmonization of the Load Range concept in relationship to Inflation Pressure (Section 2),
3. Alignment of the provisions for tyre marking and physical dimensions of PC tyres with the most recent developments in UN Regulations Nos. 30 and 54 (Sections 3.3 and 3.5),
4. Harmonization of FMVSS 139 requirements relative to UNECE PSI index (Sections 3.14 and 3.15),
5. Deletion of provisions for physical dimensions of LT/C tyres based on FMVSS 139 (Section 3.20) an UN Regulation No. 54 (Section 3.21) and addition of new harmonized provisions for physical dimensions of LT/C tyres (new Section 3.20),
6. Deletion of provisions for high speed test for LT/C tyres based on FMVSS 139 (Section 3.19) and UN Regulation No. 54 (Section 3.16) and addition of new harmonized provisions for high speed test for LT/C tyres (new Section 3.16),
7. Updates of the Annexes 3 and 6 with regard to the most recent developments in UN Regulations Nos. 30 and 54.

Other topics to be discussed within the informal working group for the Phase 2 of development of UN GTR No. 16 include:

1. Consideration of feasibility of harmonization of endurance test for LT/C tyres (Sections 3.16 and 3.17), and
2. Consideration of feasibility of development of provisions for global tyre marking.

Informal working group draft document with comments and text mark-up.