Passing on the right
From New Zealand Motorcycle Wiki
This section should be read in conjunction with the general requirements about passing other vehicles. You must comply with all the sections of the act.
The general rule allowing passing on the right is specified by Land Transport (Road User) Rule 2004 (SR 2004/427), section 2.3(1).
A driver, when driving, must not use—
(a) a lane that has been declared unavailable by an over-head traffic signal showing a red diagonal cross; or
(b) on a two-way roadway marked in 2 or more lanes, a lane on the right side of the centre line unless the driver is passing
another vehicle travelling in the same direction; or
(c) on a two-way roadway marked in 3 lanes,—
(i) the lane on the right side of the roadway; or
(ii) the centre lane unless the driver is turning right into another roadway or a vehicle entrance or is passing
another vehicle travelling in the same direction; or
(d) a lane to the driver's right of a no-passing line; or
(e) the area on the right side of a row of traffic cones or other delineators placed so that they separate traffic travelling
in opposite directions; or
(f) a special vehicle lane reserved for a specific class or classes of vehicle unless—
(i) the vehicle is one of the class or classes of vehicle for which the lane is reserved; or
(ii) the vehicle is an emergency vehicle being used in an emergency.
Passing on the right is prohibited in those cases specified by the Land Transport (Road User) Rule 2004 (SR 2004/427), section 2.7.
A driver must not pass or attempt to pass on the right of another vehicle moving in the same direction when—
(a) approaching or crossing an intersection unless—
(i) the roadway is marked in lanes and the driver can make the movement without the driver's vehicle encroaching
on a lane available for opposing traffic; or
(ii) in any other case, the driver can make the movement with safety and with due consideration for users of the
intersecting road; or
(b) approaching or passing a flush median, unless the driver—
(i) intends to turn right from the road marked with the flush median into another road or vehicle entrance; or
(ii) has turned right onto the road marked with the flush median; or
(iii) can make the entire movement without encroaching on the flush median.