6.4.3.2. For the category S3 device specified in UN Regulation No. 7 or 148
In height: The horizontal plane tangential to the lower edge of the apparent surface shall not be less than 850 mm above the ground.
However, the horizontal plane tangential to the lower edge of the apparent surface shall be above the horizontal plane tangential to the upper edge of the apparent surface of the category S1 device specified in UN Regulation No. 7 or 148 or stop lamp specified in UN Regulation No. 50 or stop lamp for category L vehicles of UN Regulation No. 148.
In length: at the rear of the vehicle."
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6.4.3.2. For the category S3 device specified in Regulation No. 7
In height: The horizontal plane tangential to the lower edge of the apparent surface shall not be less than 850 mm above the ground.
However, the horizontal plane tangential to the lower edge of the apparent surface shall be above the horizontal plane tangential to the upper edge of the apparent surface of the category S1 device specified in Regulation No. 7 or stop lamp specified in Regulation No. 50.
In length: at the rear of the vehicle.
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