Bad weather changes both what you can see and how much grip the tyres have. Switching on a lamp is only part of the response: speed, distance and observation must change too.
Start with visibility, not the speed sign
Ask whether you could stop for a foreseeable obstacle within the distance you can actually see. A posted maximum does not promise that driving at that speed is safe. Increase the gap behind the vehicle ahead rather than following its tail lights closely for guidance.
Before moving off, clear the windows, mirrors and lights. A small cleared patch in an otherwise obscured windscreen is not enough to observe junctions and people approaching from the side.
Use the correct fog lights
Under the current Belgian rule, rear fog lights, when fitted, must be used in fog or snowfall reducing visibility below about 100 metres, and in heavy rain. Switch them off when those conditions no longer apply. Front fog lights may be used in fog, snow or heavy rain; they are not lights for every dark evening.
Check the dashboard symbol rather than assuming an automatic setting has activated the correct lamps. Automatic daytime running lights do not necessarily mean the rear lights are on.
Keep manoeuvres gentle
On a wet or slippery surface, leave room to brake progressively and steer smoothly. Avoid creating a situation that requires a sudden swerve around a puddle. If traction drops, abrupt inputs can make control harder; slow down before the hazardous section rather than relying on a last-second correction.
In snow or ice, consider whether the journey can wait. More electronic assistance does not create unlimited grip.
Review a weather question properly
Identify the condition, the available visibility and the action asked about. A question about when a rear fog lamp is mandatory is different from a question about a safe following distance. Explain both decisions separately. The best preparation connects the lamp rule to a broader aim: seeing, being seen and retaining space to react.
Official sources
Rules and procedures checked on 21 September 2026. Follow the linked authority for later changes; rules announced for a future date are not yet in force.
