Code yellow across the country due to dense fog: 'Can be very treacherous'

The KNMI warns that fog can be "very localized and treacherous," potentially disrupting traffic. Visibility may drop below 200 meters in some areas, with persistent fog expected until 9 AM. Drivers are advised to use front fog lights in low visibility and rear fog lights only when visibility is under 50 meters. Initially, the warning was for the northern regions, but it was later extended to the entire country.