What is the meaning of the following traffic sign?

- Cross the roundabout from its left.
- Roundabout ahead.· Correct answer
- The drivers inside the roundabout should yield when you enter it.
- No right-of-way in the next square.

Sign 121 is a warning sign that gives notice of a roundabout ahead. It does not determine right of way - it only warns of the roundabout.
Sign 121 (yellow triangle) = warning of a roundabout ahead.
Confusing it with sign 303 (give way at the roundabout).
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