Reduced visibility is considered to be:

• 1Limited sightlines of less than 300 m.
• 2Visibility of the road in the direction of travel of less than 300 metres, limited by a bend in the road.
• 3Visibility of the road in the direction of travel of less than 300 m at dusk, in conditions of fog, rain, snowfall, etc.
• 4Dangerous turn, dangerous ascent, dangerous descent.