Motorway rules

At night on a motorway, what do white reflective road studs mark?

The central reservation
The lanes and the lines between them
Correct
The left edge of the carriageway
The entrance to a service area

Why?

Reflective studs are colour-coded to show the road layout. Rule 132 of The Highway Code says white studs mark the lanes and the gaps between them; red mark the left edge, amber the central reservation, and green the slip road and lay-by entrances.

Highway Code rule 132

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