Correct answer
Rear fog light.
The rear fog lamp. Article 106 requires it in particularly adverse conditions, including dense dust or smoke clouds. Switch it off once those conditions cease to avoid discomfort. Front lighting in reduced visibility follows the front-fog, dipped-beam or main-beam alternatives and other lighting and dazzling rules; switching all of them on together is not always required.
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Reversing light.
Hazard warning lights.
Rear fog light.
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