What colour are the reflective studs between a motorway and its slip road?
The studs between the carriageway and the hard shoulder are normally red. These change to green where there’s a slip road, helping you to identify slip roads when visibility is poor or when it’s dark.
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What are reflective studs?
They are used on white lines on the road surface and are generally either white, red, amber or green.
What is a slip road?
Rule 259 of the highway code states: “When you join the motorway you will normally approach it from a road on the left (a slip road) or from an adjoining motorway.”