What should a driver remove to improve vision before entering a tunnel?

To improve vision before entering a tunnel, the driver should remove sunglasses. Sunglasses are designed to reduce glare and protect against bright sunlight, which is useful during daylight driving. However, as a driver approaches a tunnel, the light conditions change dramatically from bright daylight to the relatively dark environment inside the tunnel.

If a driver continues to wear sunglasses, their vision may be compromised in the tunnel, making it difficult to see clearly and evaluate the road and any potential hazards. Therefore, removing sunglasses allows the driver to adapt more quickly to the darker conditions of the tunnel, ensuring better visibility and safety while driving.

In contrast, items like a sun visor, hat, or contact lenses do not typically affect one’s ability to see clearly in low-light scenarios. A sun visor might even help in some bright conditions prior to entering a tunnel, and hats generally have no effect on vision. Contact lenses, when fitted correctly, do not hinder sight and should remain on for optimal clarity.