In tunnels, when must you use your headlights?

Using headlights in tunnels is essential for several reasons, which underscore the importance of option C. Regardless of whether the tunnel is lighted, using your headlights ensures maximum visibility for you and for other road users. Tunnels can have varying levels of lighting, and even in well-lit areas, the use of headlights helps improve visibility, particularly in situations where shadows may obscure a driver's view.

Additionally, turning on headlights creates a more visible profile for your vehicle, helping other drivers and pedestrians perceive your presence, reducing the likelihood of accidents. This is especially crucial in narrow tunnels where space is limited, and other vehicles or cyclists may be present. Complying with this requirement enhances safety, ensuring that drivers can react swiftly to any unforeseen circumstances, such as sudden stops or the presence of hazards.

Thus, regardless of other conditions like the time of day or the presence of vehicles, using headlights in tunnels is a fundamental practice for safe driving.