Warning Indication. 5.5.1. The warning indication shall be by means of an optical warning signal conforming to Regulation No. 121.
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Warning Indication. 5.5.1. The warning indication shall be by means of an optical warning signal conforming to UN Regulation No. 121.
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Warning Indication. 5.5.15.3.5.1. The warning indication shall be by means of an optical warning signal conforming to Regulation No. 121.
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Samples: www.unece.org