Division 4.3. Section 3: Section 3 shall be composed of the following elements in the following order:

the number of the UN Regulation laying down the applicable requirements-, followed by the letter ‘R’;

two digits (with leading zeros as applicable) indicating the series of amendments that lay down the applicable requirements (00 for the original version of the UN Regulation);

a slash and the number of the supplement to the original version or series of amendments laying down the applicable requirements (with leading zeros as applicable);

the implementing stage, if applicable, a slash and one or two character(s).