Correct answer
To indicate the edge of the carriageway or the limits of roadworks sections.
Horizontal road studs are road safety devices installed on the road surface to reflect light from vehicles, indicating the edge of the carriageway or the limits of roadworks sections, improving the visibility of road markings and guiding drivers, especially at night or in bad weather. They are sometimes called "cat's eyes" and help to delineate lanes and the edges of the carriageway, helping to prevent accidents.
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To indicate the edge of the carriageway or the limits of roadworks sections.
To reinforce any other safety measure.
To close off a road or prohibit entry to it.
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