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.

You may also be interested in these theory test questions

How should you use the emergency telephone on a motorway?

Which vehicles are prohibited from using the motorway?

You’re on a smart motorway. A mandatory speed limit is displayed above the hard shoulder. What does this mean?

On a motorway, what’s an emergency refuge area used for?

You’ve broken down on a motorway. In which direction should you walk to find the nearest emergency telephone?

You’re on a motorway. There’s a contraflow system ahead. What would you expect to find?