You’re on a motorway in fog. The left-hand edge of the motorway can be identified by reflective studs. What colour are they?

Explanation: Be especially careful if you're on a motorway in fog. Reflective studs 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 edge of the carriageway
- white between lanes
- amber on the right-hand edge of the carriageway
- green between the carriageway and slip roads

Category: Vehicle handling

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