1/5
including: road studs, instrument panel lights
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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 roadworks are taking place
reflective road studs mark the lanes and edge of the carriageway