I am about to leave to go to work (on the motorway) and I was having a discussion with my housemate.
When I see cars joining from a slip road, I move across because otherwise, how the feck are they meant to join? She said I am wrong and it is their responsibility to join safely and I don't have to move to the middle lane.
A brief glance at the highway code suggests the slip roads are for accelerating to gain speed to join safely.
So, who is BU?