Proposal for Supplement 3 to the original version of UN Regulation No. 172 to amend para. 1.1. to clarify that this Regulation applies to retreaded pneumatic tyres of Classes C1, C2 and C3 with regard to their snow performance and for C2 and C3 tyres with regards to their classification as traction tyre, and insert new para. 1.2. to state that Contracting Parties shall issue or accept approvals to snow performance of retreaded tyres of classes C1, C2 and C3 and/or the classification as traction tyres for retreaded tyres of classes C2 and C3.