In an insufficiently lit tunnel, it is important to use the **appropriate lighting** to ensure safety. According to the regulations, in these cases, the **high beam headlights** or long-range lights must be turned on, as long as they do not dazzle other road users. This is mandatory when the tunnel is outside a municipality and is not well lit, regardless of whether it is day or night.

The **high beam headlights** are suitable for situations where there is little natural light, such as in poorly lit tunnels, as they provide optimal visibility for the driver. However, it is crucial to ensure that these lights do not dazzle other drivers, as this could cause accidents.

On the other hand, the **low beam headlights** are used in situations where there is a risk of dazzling others or when driving at less than 40 km/h. However, in the case of an insufficiently lit tunnel and driving at 80 km/h, the high beam headlights are the correct option, provided they are used with caution to avoid affecting other drivers.