The distance from the sign to the beginning of the first turn.
The distance from the first turn to the beginning of the second turn.
The length of the road section with dangerous turns.✓Bonne réponse
Explication
The supplementary plate has arrows at both ends of the stated distance, so it describes how far the hazardous series of bends continues. A plate giving the distance to the first bend would use a single directional arrow and would not define the whole hazardous section.
