Instead of waiting in a long queue for the left/straight ahead exit?
Most roundabouts I use daily have heavier traffic in the left hand lane, (going to centre, retail parks, general main roads etc) and the right one normally has 2 or 3 cars waiting in comparison.
I generally just go into the right hand lane, then go all the way around and back to the exit I need, as its quicker.
Especially when it is a traffic light controlled one, the lights always let 3 cars through and change back.
A few people with me have thought it was strange, so it got me thinking if it was a driving 'taboo' (or unreasonable...)
Are you supposed to stick to the lane you need?