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Rule 132 ↗
Reflective road studs may be used with white lines.
White studs mark the lanes or the middle of the road.
Red studs mark the left edge of the road.
Amber studs mark the central reservation of a dual carriageway or motorway.
Green studs mark the edge of the main carriageway at lay-bys and slip roads.
Green/yellow studs indicate temporary adjustments to lane layouts, e.g. where road works are taking place.
Decoding the Road :
A Guide to Reflective Road Studs
White Studs : Lane & Road Center
These are used to mark individual traffic lanes or the center of the road to keep vehicles aligned .
Amber Studs : Central Reservation
These indicate the right - hand edge of the road . marking the central reservation on dual carriageways or moterways .
Green Studs : Lay - bys and Slip Roads
Green markers highlight the edge of the main carriageway specifically where it meets entrance or exit points like slip roads .
Red Studs : The Left Boundary: These studs are placed to clearly mark the far - left edge of the drivable road surface .
Green / Yellow Studs : Road Works
This dual - color combination indicates temporary adjustments to lane layouts , commonly seen during construction or road maintenance .
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