Revision 1 | Amendment 1 has been prepared purely as documentation tool. The authentic and legally binding text is WP.29/2011/38. This document incorporates the following change:

Revision 1 | Amendment 2 has been prepared purely as documentation tool. The authentic and legally binding text is WP.29/2011/112. This document incorporates the following change:

Revision 1 | Amendment 3 has been prepared purely as documentation tool. The authentic and legally binding text is WP.29/2012/26. This document incorporates the following change:

Revision 1 | Amendment 4 has been prepared purely as documentation tool. The authentic and legally binding text is WP.29/2012/94. This document incorporates the following change:

Proposal as adopted by the Working Party on General Safety Provisions (GRSG) at its 102nd session to add “A” and “AUTO” symbols for automatic systems and to apply ISO alert color coding (degree of danger hierarchy) to symbols 25 and 28 (brake system malfunction and parking brake, respectively).

This proposal is considered to be adopted and are binding upon all Contracting Parties applying Regulation No. 121 as of 15 July 2013.

Revision 1 | Amendment 5 has been prepared purely as documentation tool. The authentic and legally binding text is WP.29/2012/30. This document incorporates the following change:

Proposal for transitional provisions concerning the electronic stability control telltale and approval markings related to UN R121.

Revision 2 has been prepared purely as documentation tool. The authentic and legally binding texts are WP.29/2012/94, WP.29/2012/26, WP.29/2011/112, WP.29/2011/38, and WP.29/2012/30. This document incorporates the following changes:

Proposal for transitional provisions concerning the electronic stability control telltale and approval markings related to UN R121.

Proposal as adopted by the Working Party on General Safety Provisions (GRSG) at its 102nd session to add “A” and “AUTO” symbols for automatic systems and to apply ISO alert color coding (degree of danger hierarchy) to symbols 25 and 28 (brake system malfunction and parking brake, respectively).

This proposal is considered to be adopted and are binding upon all Contracting Parties applying Regulation No. 121 as of 15 July 2013.

Revision 2 | Amendment 1 has been prepared purely as documentation tool. The authentic and legally binding text is WP.29/2016/97. This document incorporates the following change:

Proposal to enable the use of alternate colors (per footnote 18 of Table 1 and in line with ISO Standard 2575) for certain lighting tell-tales in order to indicate light source failures in response to the proposals for light failure indicators under UN Regulations Nos. 7, 48 and 87 (GRE/2016/7, GRE/2016/12 and GRE/2016/17) as adopted by GRE. This proposal anticipates use of the same approach in response to plans for additional failure indication requirements for other lighting regulations.

Revision 1 | Amendment 6 has been prepared purely as documentation tool. The authentic and legally binding text is WP.29/2016/96. This document incorporates the following change:

Proposal to enable the use of alternate colors (per footnote 18 of Table 1 and in line with ISO Standard 2575) for certain lighting tell-tales in order to indicate light source failures in response to the proposals for light failure indicators under UN Regulations Nos. 7, 48 and 87 (GRE/2016/7, GRE/2016/12 and GRE/2016/17) as adopted by GRE. This proposal anticipates use of the same approach in response to plans for additional failure indication requirements for other lighting regulations.

Revision 2 | Amendment 2 has been prepared purely as documentation tool. The authentic and legally binding texts are WP.29/2017/116 and WP.29/2017/116/Corr.1. This document incorporates the following change:

Proposal to add a telltale and symbols for “Accident Emergency Call System (AECS)” and to align UN R121 with the 07 series of amendments to UN Regulation No. 16:

1. the term “seat belt” is replaced by “safety belt”,
2. the symbol for safety belt, defined in item 21 of Table 1 in the Regulation, may be displayed in different colours to convey different meanings. Therefore, the existing footnote 18 has been added to item 21, and
3. this symbol may be replaced by different symbols for seats other than those of the front row. Therefore, a new footnote 22 is added to item 21.

Proposal from the WP.29 Secretariat for additional corrections to the table of tell-tales, concerning items 31 (Combustion
pre-heat; engine start aid) and 32 (Choke (cold starting device)).

Revision 2 | Amendment 3 has been prepared purely as documentation tool. The authentic and legally binding text is WP.29/2018/26. This document incorporates the following change:

Proposal to apply footnote ¹⁸ to the symbol for tell-tale No. 1 (master lighting switch) in order to simplify the treatment of colour changes of tell-tales. Footnote ¹⁸ specifies "“Symbol may be shown in other colours than specified in column 5 in order to convey different meanings according to the general colour coding as proposed in paragraph 5. of ISO 2575-2004.” This proposal clarifies the existing understanding of the intent of the regulation and in particular addresses concerns over interpretation where tell-tales Nos. 1 and 19 have been combined.

Revision 1 | Amendment 7 has been prepared purely as documentation tool. The authentic and legally binding text is WP.29/2018/25. This document incorporates the following change:

Proposal to apply footnote ¹⁸ to the symbol for tell-tale No. 1 (master lighting switch) in order to simplify the treatment of colour changes of tell-tales. Footnote ¹⁸ specifies "“Symbol may be shown in other colours than specified in column 5 in order to convey different meanings according to the general colour coding as proposed in paragraph 5. of ISO 2575-2004.” This proposal clarifies the existing understanding of the intent of the regulation and in particular addresses concerns over interpretation where tell-tales Nos. 1 and 19 have been combined.

Revision 2 | Amendment 4 has been prepared purely as documentation tool. The authentic and legally binding text is WP.29/2020/22. This document incorporates the following change:

Proposal in line with ISO 2575 to allow for the use of different colors (e.g., red, yellow, green) to convey the status modes (e.g., failure, active) of seven functions via modification of footnote 18 under Table 1.

Revision 2 | Amendment 5 has been prepared purely as documentation tool. The authentic and legally binding text is WP.29/2022/22. This document incorporates the following change:

Proposal to apply the same tell-tale requirements for tyre pressure refill systems (TPRS) and central tyre inflation systems (CTIS) as already in place for tyre pressure monitoring systems (TPMS).