What is the meaning of this sign?

- In 2,500 meters a steep uphill climb begins.
- Steep downhill slope for 2,500 meters begins here.
- Steep downhill slope about 2,500 meters ahead.· Correct answer
- The end of a 2,500-meters downhill slope section.

The steep descent sign (140) appears with a supplementary sign indicating the distance until the descent begins. When '2,500 m' is written on the supplementary sign, it means that the steep descent begins in another 2,500 metres. This is an early warning to prepare for downshifting and braking.
Supplementary sign with a number before a descent = distance to the start
Confusing the distance to the start of the descent with the length of the descent itself
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