What colour are the reflective studs along the left-hand edge of the motorway?

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What colour are the reflective studs along the left-hand edge of the motorway?

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Reflective studs are used to help you in poor visibility. Different colours are used so that you’ll know which lane you’re in. These are
• red on the left-hand edge of the carriageway
• white between lanes
• amber on the right-hand edge of the carriageway
• green between the carriageway and slip roads.