Rear fog lightsBrussels
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162. Rear fog lights
Rear fog lights are bright red lights at the rear of a vehicle that make it easier for following road users to see the vehicle when visibility is severely reduced. They are much brighter than normal rear position lights.
Because rear fog lights can dazzle or distract drivers behind, they should only be used in the weather conditions permitted by local traffic rules and should be switched off when visibility improves.
Wikimedia.org • Ehsnils • CC BY-SA
When must rear fog lights be used in Belgium?
Rear fog lights must be used when fog or snowfall reduces visibility to less than approximately 100 metres. They must also be used during heavy rain.
Is there a 100-metre visibility requirement during heavy rain?
No. The 100-metre threshold applies specifically to fog and snowfall. During heavy rain, rear fog lights must be used without a separate visibility-distance threshold being specified.
May rear fog lights be used in normal weather in Belgium?
No. Rear fog lights may only be used in the circumstances prescribed by the Road Code. They must be switched off when those conditions no longer apply.

Traffic rules
Brussels