What colour are the reflective studs at the left-hand edge of the motorway?

Explanation: Reflective studs on the motorway are there to help you in poor visibility. Different colours are used so that you'll know which lane you're in. These are
- red on the left-hand side of the road
- white between lanes
- amber on the right-hand edge of the carriageway
- green between the carriageway and slip roads.

Category: Band 2 traffic signs and signals

References: The Official DVSA Guide to Driving: Section 11, Highway Code: Rule 132