What does a round blue sign with a white arrow pointing down and to the right mean?

Answer and explanation

Correct answer: C. Keep to the right side of the obstacle

  1. Step 1: It tells traffic to pass the obstacle on its right side.
  2. Step 2: The obstacle is on the left.
Answer
Keep to the right side of the obstacle.
Why not the others: Compulsory exit on the right, right lane closed ahead and speed reduction on the right don't fit.

Practise more Prohibition and mandatory signs.

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