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used on wide carriageways to divide them into lanes. You should keep between them. 

132. Reflective road studs  may be used with white lines. 

● White studs mark the lanes or the middle of the road. 

● Red studs mark the left edge of the road. 

● Amber studs mark the central reservation of a dual carriageway or motorway. 

● Green studs mark the edge of the main carriageway at lay-bys and slip roads. 

● Green/yellow studs indicate temporary adjustments to lane layouts, e.g. where road works are taking place. 

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