Proposal to amend para. 3.1.2., 12.2.1., 12.2.3., and 12.2.6. to introduce Level 1A, Level 1C, or Level 2 requirements of UN Regulation No. 154 and the 01 series of amendments to UN Regulation No. 168 on real driving emissions. The proposal recognises a new Level for voluntary acceptance by Contracting Parties proposed to be included in UN Regulations Nos. 154 and 168, complementary to proposals to introduce Level 1C in those Regulations.