Correct answer
you are travelling in heavy snowfall.
A vehicle's rear fog light must be used in particularly adverse weather or environmental conditions that significantly reduce visibility, such as heavy snowfall. These lights are designed to make the vehicle more visible to drivers behind it, especially when normal visibility is severely compromised. It is important to bear in mind that the rear fog light should only be switched on if the vehicle's dipped-beam headlights, main-beam headlights or front fog lights are also switched on. In addition to heavy snowfall, this light must also be used in thick fog, very heavy rain, or in the presence of dense clouds of dust or smoke.
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you are travelling through a tunnel.
you are travelling through a mountain pass.
you are travelling in heavy snowfall.
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