What is a 'slip lane' in Tasmania and who must you give way to when using one?

1. A lane for emergency vehicles — give way to all traffic at the intersection
2. A left-turn lane separated from the intersection by a traffic island — give way to traffic on the road you are entering, oncoming vehicles turning right, and pedestrians
3. A merge lane — give way to vehicles ahead of you
4. A bus-only lane — it cannot be used by private vehicles