WP.29 (via the TyreGTR informal working group) is preparing 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. Delection 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 under this "Phase 2" development of 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.