Correct answer
The vertical beacon or reflector.
The vertical beacon or reflector, equipped with retroreflective or luminous elements. The horizontal beacon or reflector is fixed to the pavement. Both are guiding devices within road delineation signs: vertical reflectors are not excluded from that category, and barrier reflectors should not be described as two types of flat or cylindrical beacon.
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The vertical beacon or reflector.
The horizontal beacon or reflector fixed to the pavement.
A circular speed-limit sign.
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