I used to commute into Cheltenham a few years back, and on the way in on the A40, just past GCHQ, there was a roundabout, with dual carriageway entry and dual carriageway exit that immediately (maybe 50m later) filtered down to one lane. The otuer lane had no other exits or turns.
The stupidly self righteous would happily queue in single file back onto the roundabout (blocking other traffic from entering) rather than use the outer lane and filter in, by turns.
The death stares I got from people to halt my use of the outer lane were ridiculous. There were even near collisions where they might suddenly lurch out into the second lane to stop me.
I have no idea what they thought the lane was for, but using it was definitely frowned upon by many.
D