Correct answer
That they are retroreflective.
Retroreflection: it returns much of the light towards its source, helping the sign be recognised from the vehicle. Article 136 provides for retroreflective materials or devices under technical standards. This is not merely a shiny surface and does not mean every sign must have neon tubes. Visibility also depends on illumination, maintenance and environmental conditions.
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All options
That they are retroreflective.
That they must emit light through neon tubes.
That they absorb all headlight light without returning it.
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