What does this traffic sign indicate?

Question

DentroTest · Accepted Answer

Information sign S-5 informs of the start of a tunnel, an underpass or a road section equated to them. When a figure in meters appears at the bottom of the sign, it specifies the total length of the tunnel, not the distance remaining to reach it. Therefore, it has no relation to the entrance to a built-up area or to heritage or historic elements.

What does this traffic sign indicate?

Want to pass the Permit AM (English) theory test first time?