Q #328 - When are you allowed to stop on a motorway?
You must stop if overhead gantry signs show flashing red lights above every lane on the motorway. If any of the other lanes doesn't show flashing red lights or a red cross, you may move into that lane and continue if it's safe to do so.
When you need to walk and get fresh air
When you wish to pick up hitchhikers
When you're signalled to do so by flashing red lights