Proposal to amend UN Regulation No. 40 concerning the approval of motorcycles and mopeds with positive-ignition engines regarding emission of gaseous pollutants by establishing comprehensive specifications and test procedures. The regulation applies to vehicles of categories L₃, L₄ and L₅, defining test requirements including Type I (exhaust emissions after cold start), Type II (tailpipe emissions at idle and free acceleration), and Type VII (energy efficiency). Vehicle sub-classification by engine capacity and maximum speed determines applicable test cycles from the WMTC procedure. Emission limits are specified for carbon monoxide, hydrocarbons, and nitrogen oxides. Conformity of production procedures are detailed with sampling and statistical analysis methods. Transitional provisions permit approvals under preceding series and from two years after entry into force allow refusal of first registration for vehicles not meeting the 03 series requirements.