What does a blue circular sign with a white symbol usually mean?

Answer and explanation

Correct answer: C. A mandatory instruction

  1. Step 1: Blue circles give a mandatory instruction, for example a compulsory direction.
  2. Step 2: The driver must obey it.
Answer
A mandatory instruction.
Why not the others: A prohibition on certain vehicles, a warning of a hazard ahead and a priority road for all traffic don't fit.

Practise more Shapes and colors of signs.

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