If you don’t use lane 1 on the motorway...

[SpidersWithBellsOn]

... why not?

Every time I use a motorway I see a number of cars not moving into the leftmost lane even when it’s visibly clear for miles. Why do they do it? Is there a higher chance of hitting an animal? Slightly nicer surface? Easier to follow when it’s dark? Is lane 1 only for HGVs, caravans and horseboxes and nobody told me?

Genuine question.

You don’t say. You’re a bright one.

They don’t have motorway junctions though. They don’t tend to have enough lanes for that.