Under the DGT’s advisory “three V” fog guideline, which speed figure corresponds to visibility of 50 metres?

Correct answer

50 kilometres per hour

50 km/h in that advisory example: 50 m visibility, 50 km/h speed and 50 m separation from the preceding vehicle. It is not a universal legal limit or a guarantee of safe stopping. Reduce speed further when the road surface, vehicle or visibility requires it, be able to stop within the visible distance, and obey any lower limit. If continuing is unsafe, leave the road for a suitable place; do not voluntarily stop on the shoulder.