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UN Regulations
ning the unit category code of the special warning light, "T," "HT," or "X," with "A," "B," or "R," which indicates the colour that can be emitted.-Special warning lights in the T, HT and X categories can only be approved in one of three colours: blue, yellow or red, and simultaneous lighting of multiple colours is prohibited. -Amendments of provision, "It shall not possible for a user to activate a group of multiple flashes (flash patterns) that...
Regulations Updated at: 2026/03/27



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