Correct answer
Where the nearest SOS emergency point is located
The nearest emergency post or station from which help can be requested after a crash or breakdown; its distance may be shown. This is a specific assistance sign, not a claim that all tunnel safety signs only identify SOS points: other signs mark different facilities and exits.
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The maximum and minimum speed at which you may drive
Whether overtaking is possible inside the tunnel
Where the nearest SOS emergency point is located
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