Correct answer
The side of the refuge, island or obstacle that must be passed.
It indicates the side of the refuge, island or obstacle that vehicles must pass: for R-401a, the right side. It does not indicate that the entire road is one-way and is not merely a recommendation.
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That the entire road is one-way.
An optional recommendation on lane choice.
The side of the refuge, island or obstacle that must be passed.
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Sign R-401A: mandatory passage
What this sign means, its category and its shape.
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