When must the rear fog light be used?
Lighting
Explanation
The **rear fog lights** are essential for improving visibility in adverse weather conditions. These lights are red and are used in situations where visibility is greatly reduced, such as in cases of **fog, heavy snow, heavy rain, and smoke**.
- **Heavy snow**: When it snows heavily, visibility can drastically decrease. In these conditions, rear fog lights help other drivers see your vehicle from behind, reducing the risk of accidents.
It is important to remember that these lights should only be used when they are truly necessary, as improper use can dazzle other drivers. Therefore, the correct answer is that they should be used **when it snows heavily**.
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