Where are fluorescent green/yellow reflective studs used to mark the carriageway? Where are fluorescent green/yellow reflective studs used to mark the carriageway?

• Possible answers:

   
• A. At contraflow systems and roadworks
• B. At slip-road exits and entrances
• C. Between the edge of the carriageway and the central reservation
• D. Across the road, marking where roadworks start and finish