What lights should be used when driving through a tunnel?

When driving through a tunnel, using dipped-beam headlights is essential for several reasons. Dipped-beam headlights provide adequate illumination of the road ahead without causing glare that can hinder the visibility of other drivers. Tunnels can often have limited lighting, and using dipped beams ensures that you can see clearly while also being considerate of other road users.

Full beam headlights are generally inappropriate in this context because they can dazzle oncoming traffic and other vehicles in close proximity. Fog lights are designed for use in conditions with reduced visibility due to fog, heavy rain, or snow, and are not suitable for general driving in tunnels. Side lights are insufficient for illuminating the road and are not meant for driving in tunnels where increased visibility is necessary. Therefore, using dipped-beam headlights is the safest and most effective choice to ensure good visibility for yourself and others while navigating through a tunnel.