Tasmanian Consolidated Regulations
A
"roundabout" is an intersection with (a) either
(i) 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
(ii) room for one or more lines of traffic travelling in the same direction around a central traffic island; and
(b) a roundabout sign at each entrance.
Note 1: Intersection, marked lane, traffic and traffic island are defined in the dictionary. Note 2: Rule 322 (3) and (4) deal with the meaning of a traffic sign at a place.
Roundabout sign