Bus Lane
A bus lane is a traffic lane restricted to buses on certain days and times, and generally used to speed up public transport that would be otherwise held up by traffic congestion.
Australian Road Rules
The Australian Road Rules define a bus lane as: a marked lane, or the part of a marked lane:
(a) beginning at a bus lane sign (whether or not there is also a bus lane road marking) and ending at the nearest of the following:(i) an end bus lane sign;
(ii) a traffic sign that indicates the beginning of another special purpose lane; or
(b) beginning at a bus lane road marking (if there is no bus lane sign) and ending at the next intersection.