Particular Specifications. 7.1. Requirements as to shape and dimensions 7.1.1. Shape and dimensions of the triangle (see Annex 3) 7.1.1.1. The theoretical sides of the triangle shall be 500 ± 50 mm long. 7.1.1.2. In the case of an advance warning triangle of type 1, the retro-reflecting units shall be arranged along the edge within a strip of an unvarying width which shall be between 25 mm and 50 mm. In the case of an advance warning triangle of type 2 with fluorescent retro-reflecting material, the unvarying width shall be between 50 mm and 85 mm.
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Sources: Agreement Concerning the Adoption of Harmonized Technical United Nations Regulations for Wheeled Vehicles, Agreement Concerning the Adoption of Uniform Technical Prescriptions for Wheeled Vehicles