What fundamental technical feature must traffic signs possess to ensure their visibility at night?

Question

DentroTest · Accepted Answer

The correct answer is that they must be reflective (or technically, retroreflective). According to traffic regulations, signs must be designed with materials that bounce the light from the vehicle's headlights back towards the driver. This allows them to be legible in the dark without needing their own internal lighting. Options like 'neon lights' are incorrect as standard signs do not emit their own light, and 'bright' is an imprecise term that does not define the physical property necessary for nighttime road safety.

What fundamental technical feature must traffic signs possess to ensure their visibility at night?

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