How must traffic signs be in order to be visible at night?
Signage: Vertical signs
Explanation
For **traffic signs** to be visible at night, they must be **reflective**. This means they are designed to reflect the light from vehicle headlights, allowing drivers to see them clearly in low-light conditions.
- Reflective signs do not need their own light source, such as neon lights, to be visible. Instead, they utilize the light they receive from vehicles to stand out.
- This type of sign is especially useful in situations where lighting is insufficient, such as on poorly lit roads or during the night, ensuring that drivers can see them from a safe distance.
Therefore, reflective signs are essential for road safety, as they ensure visibility without relying on additional light sources.
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