Where are amber reflective studs found on a motorway?

A: Between the hard shoulder and the carriageway

B: Between the acceleration lane and the carriageway

C: Between the central reservation and the carriageway

D: Between each pair of lanes

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Amber reflective studs are common on UK motorways.

Rule 132 of the UK highway code relates to the use of reflective road studs with white lines and states that:

Amber studs mark the central reservation of a dual carriageway or motorway.

In addition to amber reflective studs, there are other coloured studs used in different ways:

White are for normal marking of lanes or the middle of the road
Red appear on the left hand side
Green are for the edge of the main carriageway at laybys and slip roads (The Sun reported that only a third of drivers are able to identify the colour of these particular ones)
And green/yellow are used to indicate temporary changes to lane layouts. For example, when there are road works

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