What do directional panels indicate?

A)That it is a reversible lane.
B)That the road is permanently closed.
C)They prohibit passage and inform about the direction of traffic.Correct
The directional panel prohibits passage and also provides information about the direction of traffic.
A reversible lane, as in answer b), will be delimited by double broken lines on each side of the lane.
Normally, fixed barriers and/or a fixed red light are used to close the road. (Answer c)
A reversible lane, as in answer b), will be delimited by double broken lines on each side of the lane.
Normally, fixed barriers and/or a fixed red light are used to close the road. (Answer c)