Reflective amber studs on a motorway are found on the right-hand edge of the carriageway, marking the boundary next to the central reservation (the median strip between opposite directions of traffic). They indicate the right-most lane of a dual carriageway or motorway and help drivers keep away from the central reservation, especially in poor visibility or at night.

Details on Reflective Amber Studs:

• Positioned along the right side of the motorway, next to the central reservation.
• They serve as guidance to keep vehicles in the right-most lane.
• They are especially useful in darkness or adverse weather to help judge lane position.
• Contrast with other colored studs: red studs mark the left edge of the road, white studs separate lanes, and green studs show slip road edges or lay-bys.

This positioning helps drivers maintain proper lane discipline and enhances safety by clearly marking the central reservation boundary.