At night you notice green reflective studs beside part of the carriageway. What boundary do green studs identify?
The right edge of every ordinary traffic lane
The edge of the central reservation
The left-hand edge of the main carriageway
Lay-bys and slip-road entrances or exits✓Bonne réponse
Explication
Green studs mark lay-bys and the points where slip roads enter or leave the main carriageway. The left edge of the carriageway is marked red, while amber is used beside a central reservation.