What is the function of flashing yellow lights when used as a barrier device?
Signage: Beacons and temporary signage
Flashing yellow lights are used as beacon devices to prohibit crossing the line that connects them, alerting drivers to the impossibility of driving between them.
Explanation
**Flashing yellow lights** are used as beacon devices on roads. Their main function is **to prohibit passage through the space between the lights**. This means that when you see these lights, you should not cross the imaginary line that connects them. These lights are a clear signal that the area is restricted and should not be crossed, thus ensuring safety in construction zones or where there are obstacles on the road.
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