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The sign in the image indicates the location of a tunnel on...

Signage: Vertical signs

The sign in the image indicates the location of a tunnel on...
This S-530 sign indicates the entrance to a tunnel located on a conventional or multi-lane road and also provides information about its length and the safety installations inside it.

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What is the meaning of the vertical sign shown in the image?
Signage: Vertical signs What is the meaning of the vertical sign shown in the image? Open question
Where can this sign be found?
Signage: Vertical signs Where can this sign be found? Open question
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