The warning applies to the whole of Noord-Holland. The fog is expected to linger until around 8 a.m.
With less than 200 meters of view, it is advised to switch on the fog lights at the front. Is the view less than 50 meters? Then also switch on the fog light.
Furthermore, the KNMI warns to keep extra distance from a dense fog to other cars and to clean the windows and mirrors well before departure.
Is it not necessary to go on the road now? In the event of heavy fog, it can be safer to leave a little later.