What colour are the reflective studs between a motorway and a slip road?

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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.”

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