In a tunnel, can we overtake?
A)No, in no case.
B)Yes, if we do not invade the opposite direction and we have more than one lane in our direction.Correct
C)Yes, if traffic conditions allow.
As a general rule, overtaking is forbidden in tunnels, underpasses and sections of road affected by the tunnel sign, unless we have more than one lane in our direction and we do not invade the opposite direction.