What should you do if you park on the road when it’s foggy?

A: Leave parking lights switched on

B: Leave dipped headlights and fog lights switched on

C: Leave dipped headlights switched on

D: Leave main-beam headlights switched on

View hint

Rule 251 of the UK highway code states:

It is especially dangerous to park on the road in fog. If it is unavoidable, leave your parking lights or sidelights on.

Where are amber reflective studs found on a motorway?