Red road studs mark the left edge of the road. What do they indicate?

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

Answer: (A)

Red road studs identify the left edge of the carriageway. They mirror the road’s boundary on the left, helping you stay on the road in poor visibility or at night. They show where the verge or hard shoulder begins, so you don’t creep past the edge. Other colors of studs indicate different boundaries or features, but red clearly marks the left-hand edge.