What does this sign mean?

En español: ¿Qué significa esta señal?

What does this sign mean?
A Electronic toll (ETC)
B Shared-use path for pedestrians, cycles and personal mobility vehicles
C One-way section Correct answer
D Lay-by in tunnels

Why this is the correct answer

Indicates that on the section of carriageway continuing in the direction of the arrow, vehicles must travel in the direction shown and that traffic in the opposite direction is prohibited.

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