Traffic Regulations, Schedule 3 - Australian Road Rules 1999

A roundabout is an intersection:

with either:

one or more marked lanes, all of which are for the use of vehicles travelling in the same direction around a central traffic island; or

room for one or more lines of traffic travelling in the same direction around a central traffic island; and

with or without a roundabout sign at each entrance.

Notes

1 Intersection,

marked lane, traffic and traffic island are defined in the dictionary.

2 Rule 322(3) and (4) deal with the meaning of a traffic sign at a place.

Roundabout sign