Motorway studs (also called cat’s eyes)

Red stud – edge of the road
Green stud – mark the area when slip road merges the carriageway or motorway.
White stud – separates lanes in the middle of the road
Amber stud – central reservation of carriageway of motorway
Greenish/yellow studs – temporary adjustments to lane layouts, e.g. where road works are taking place

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