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UN Regulation No. 27
Advance Warning Triangles

Uniform Provisions Concerning the Approval of Advance-Warning Triangles

This Regulation applies to certain advance-warning devices intended to be on board vehicles and to be placed on the carriageway in order to signal, by day and at night, the presence of a halted vehicle.

This regulation will be superseded by a new UN Regulation on Retro-Reflecting Devices (RRD) under the Simplification of Lighting Regulations program.

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Revisions and Amendments
Series of Amendments and Supplements

Application of the Regulation

Contracting Parties applying UN R27

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Development of the Regulation

Pending Changes to UN R27

Latest Documents

17 Jan 2019
UN R27: Proposal for the 05 series of amendments | WP.29/2018/97/Rev.1
31 Oct 2018
SLR: Final transitional provisions to "freeze" UN Regulations Nos. 3, 4, 6, 7, 19, 23, 27, 38, 50, 69, 70, 77, 87, 91, 98, 104, 112, 113, 119 and 123 | WP.29-176-05
19 Oct 2018
Comments on document GRE/2018/34 (Collective amendments to UN Regulations Nos. 3, 4, 6, 7, 19, 23, 27, 38, 50, 69, 70, 77, 87, 91, 98, 104, 112, 113, 119 and 123) | GRE-80-21
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Latest Meeting Discussions

World Forum for the Harmonization of Vehicle Regulations | Session 178 | 24-28 Jun 2019
World Forum for the Harmonization of Vehicle Regulations | Session 177 | 11-15 Mar 2019
World Forum for the Harmonization of Vehicle Regulations | Session 176 | 12-16 Nov 2018
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