In a tunnel with more than one lane for each direction of traffic, **overtaking is allowed** as long as there are no signs prohibiting it. This is because the prohibition of overtaking in tunnels mainly applies when there is only one lane per direction of traffic. In those cases, overtaking could be dangerous due to the lack of space and visibility.

- **Overtaking in tunnels:** The regulations indicate that in tunnels with traffic in both directions and only one lane per direction, overtaking should not be done. However, if there is more than one lane per direction, overtaking is possible unless a specific sign prohibits it.

- **Prohibition signs:** It is important to pay attention to traffic signs that may indicate the prohibition of overtaking in certain areas, including tunnels. If there are no signs prohibiting it, overtaking is allowed.

Therefore, in a tunnel with multiple lanes per direction, you can overtake as long as there are no signs indicating otherwise.