What is a safe practice when driving through a tunnel?

Turning on headlights and removing sunglasses is considered a safe practice when driving through a tunnel for several reasons. Tunnels often have lower visibility than the surrounding area due to limited natural light, which makes it crucial for drivers to have their headlights on to illuminate the path ahead. This enhances visibility for the driver and also makes the vehicle more visible to others, including vehicles and pedestrians in the tunnel.

Additionally, removing sunglasses is important because they can reduce visibility further in dimmer lighting conditions. Sunglasses are designed to block out bright light, but in a darker environment like a tunnel, they can make it harder to see clearly. Proper visibility through lighting and unobstructed sight aids in ensuring a safer driving experience for everyone within the tunnel.

Considering the other options: keeping windows down could introduce distractions or noise that may interfere with concentration, turning off lights would impair visibility, and accelerating to clear the tunnel quickly could lead to unsafe driving conditions and not allow for proper reaction to unexpected situations, such as the presence of other vehicles or pedestrians. Thus, turning on headlights and removing sunglasses aligns with promoting safety while navigating through the confined space of a tunnel.