UN R121: Proposal for Supplement 10 to the original series of amendments and Supplement 2 to the 01 series of amendments
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Proposal to delete footnote 18 of Table 1 regarding telltale no. 1 (Master lighting switch) when it is combined with telltale no. 19 (Position, side marker, and/or end-outline marker lamps). The footnote is redundant and potentially confusing since UN R121 already refers to paragraph 5. of ISO 2575-2004 which states, “A given symbol may be shown in more than one of the colours specified in 5.1 in order to convey a change in the operating condition.”

Reference Number: GRSG-113-39
Origin: OICA
Date: 11 October 2017
Proposal Status: Superseded
Related Documents:
GRSG-113-42 | UN R121: Proposal for Supplement 10 to the original series of amendments and Supplement 2 to the 01 series of amendments
GRSG/2017/18 | Proposal for Supplement 10 to the original series of amendments and Supplement 2 to the 01 series of amendments to Regulation No. 121
GRSG/2018/6 | UN R121: Proposal for Supplement 10 to the original series of amendments and Supplement 2 to the 01 series of amendments
Discussion(s):
Working Party on General Safety | Session 113 | 10-13 Oct 2017

37. GRE was informed that the Working Party on General Safety Provisions, at its recent session, had adopted amendment proposals on colours to Regulation No. 121 (Identification of controls, tell-tales and indicators) (GRSG-113-42 and GRSG-113-39). GRE supported the short-term solution proposed in GRSG-113-42 and noted that the long-term solution (GRSG-113-39) would be published as an official GRSG document and presented to GRE.

49. The expert from OICA presented ECE/TRANS/WP.29/GRSG/2017/18 to clarify footnote 18 where tell-tales Nos. 1 and 19 were combined. Some experts were of the opinion that footnote 12 already offers that possibility. Following the discussion, the expert from OICA offered an alternative proposal GRSG-113-39 that simplifies the handling of colour changes of tell-tales and to remove footnote 18 and all references to it. The expert from France preferred to keep the existing text of footnote 18 and to only insert under symbol No. 1 a reference to footnote 18, as reflected in GRSG-113-42. GRSG agreed to go forward with a two-step approach and adopted ECE/TRANS/WP.29/GRSG/2017/18 as reproduced below.

No.Column 1Column 2Column 3Column 4Column 5
ItemSymbol 2FunctionIlluminationColour
1.Master lighting switch


Tell-tale may not act as the tell-tale for the position (side) lamps

Master Lighting Switch Symbol1, 18ControlNo
Tell-tale 12YesGreen

50. The secretariat was requested to submit the proposal to WP.29 and AC.1 as draft Supplement 10 to the original series of amendments and Supplement 3 to the 01 series of amendments to UN Regulation No. 121 for consideration at their March 2018 sessions, subject to the endorsement of the Working Party on Lighting and Light Signalling (GRE) at its October 2017 session. (Note by the secretariat: At its seventy-eighth session, GRE endorsed the principles for amending UN Regulation No. 121 as proposed by GRSG.)

51. As a second step, GRSG requested the secretariat to distribute GRSG-113-39 with an official symbol, for consideration at the next GRSG session and to also circulate it all WP.29 Working Parties concerned.

54. The secretariat briefly introduced GRSG-113-39 to inform GRPE on activities that could be relevant. He invited delegates to consult the document and submit remarks if necessary.

Working Party on Lighting and Light-signalling | Session 78 | 24-27 Oct 2017

37. GRE was informed that the Working Party on General Safety Provisions, at its recent session, had adopted amendment proposals on colours to Regulation No. 121 (Identification of controls, tell-tales and indicators) (GRSG-113-42 and GRSG-113-39). GRE supported the short-term solution proposed in GRSG-113-42 and noted that the long-term solution (GRSG-113-39) would be published as an official GRSG document and presented to GRE.

49. The expert from OICA presented ECE/TRANS/WP.29/GRSG/2017/18 to clarify footnote 18 where tell-tales Nos. 1 and 19 were combined. Some experts were of the opinion that footnote 12 already offers that possibility. Following the discussion, the expert from OICA offered an alternative proposal GRSG-113-39 that simplifies the handling of colour changes of tell-tales and to remove footnote 18 and all references to it. The expert from France preferred to keep the existing text of footnote 18 and to only insert under symbol No. 1 a reference to footnote 18, as reflected in GRSG-113-42. GRSG agreed to go forward with a two-step approach and adopted ECE/TRANS/WP.29/GRSG/2017/18 as reproduced below.

No.Column 1Column 2Column 3Column 4Column 5
ItemSymbol 2FunctionIlluminationColour
1.Master lighting switch


Tell-tale may not act as the tell-tale for the position (side) lamps

Master Lighting Switch Symbol1, 18ControlNo
Tell-tale 12YesGreen

50. The secretariat was requested to submit the proposal to WP.29 and AC.1 as draft Supplement 10 to the original series of amendments and Supplement 3 to the 01 series of amendments to UN Regulation No. 121 for consideration at their March 2018 sessions, subject to the endorsement of the Working Party on Lighting and Light Signalling (GRE) at its October 2017 session. (Note by the secretariat: At its seventy-eighth session, GRE endorsed the principles for amending UN Regulation No. 121 as proposed by GRSG.)

51. As a second step, GRSG requested the secretariat to distribute GRSG-113-39 with an official symbol, for consideration at the next GRSG session and to also circulate it all WP.29 Working Parties concerned.

54. The secretariat briefly introduced GRSG-113-39 to inform GRPE on activities that could be relevant. He invited delegates to consult the document and submit remarks if necessary.

Working Party on Pollution and Energy | Session 76 | 9-12 Jan 2018

37. GRE was informed that the Working Party on General Safety Provisions, at its recent session, had adopted amendment proposals on colours to Regulation No. 121 (Identification of controls, tell-tales and indicators) (GRSG-113-42 and GRSG-113-39). GRE supported the short-term solution proposed in GRSG-113-42 and noted that the long-term solution (GRSG-113-39) would be published as an official GRSG document and presented to GRE.

49. The expert from OICA presented ECE/TRANS/WP.29/GRSG/2017/18 to clarify footnote 18 where tell-tales Nos. 1 and 19 were combined. Some experts were of the opinion that footnote 12 already offers that possibility. Following the discussion, the expert from OICA offered an alternative proposal GRSG-113-39 that simplifies the handling of colour changes of tell-tales and to remove footnote 18 and all references to it. The expert from France preferred to keep the existing text of footnote 18 and to only insert under symbol No. 1 a reference to footnote 18, as reflected in GRSG-113-42. GRSG agreed to go forward with a two-step approach and adopted ECE/TRANS/WP.29/GRSG/2017/18 as reproduced below.

No.Column 1Column 2Column 3Column 4Column 5
ItemSymbol 2FunctionIlluminationColour
1.Master lighting switch


Tell-tale may not act as the tell-tale for the position (side) lamps

Master Lighting Switch Symbol1, 18ControlNo
Tell-tale 12YesGreen

50. The secretariat was requested to submit the proposal to WP.29 and AC.1 as draft Supplement 10 to the original series of amendments and Supplement 3 to the 01 series of amendments to UN Regulation No. 121 for consideration at their March 2018 sessions, subject to the endorsement of the Working Party on Lighting and Light Signalling (GRE) at its October 2017 session. (Note by the secretariat: At its seventy-eighth session, GRE endorsed the principles for amending UN Regulation No. 121 as proposed by GRSG.)

51. As a second step, GRSG requested the secretariat to distribute GRSG-113-39 with an official symbol, for consideration at the next GRSG session and to also circulate it all WP.29 Working Parties concerned.

54. The secretariat briefly introduced GRSG-113-39 to inform GRPE on activities that could be relevant. He invited delegates to consult the document and submit remarks if necessary.