Amber road studs mark what feature on a dual carriageway or motorway?

• A. mark the left edge of the road
• B. mark the central reservation of a dual carriageway or motorway
• C. mark the edge of a main carriageway at lay-bys and sliproads
• D. mark lanes or middle of the road

Answer: (B)

Amber road studs mark the central reservation on a dual carriageway or motorway. They’re placed along the divider between the two directions to help you identify the location of the central barrier or verge, especially in poor visibility or at night. This helps you avoid crossing into the opposite carriageway and aids safe joining or leaving of slip roads. The edges of the carriageway and lay-bys/slip roads are signposted with other markers, so the amber color is specifically for the central reservation.