They're not breaking the rules when there's a rule that says they're exempt.
ROAD RULES 2014 - REG 305 Exemption for drivers of police vehicles
ROAD RULES 2014 - REG 305
Exemption for drivers of police vehicles
(1) A provision of these Rules does not apply to the driver of a police vehicle if:
(a) in the circumstances:
(i) the driver is taking reasonable care, and
(ii) it is reasonable that the provision should not apply, and
(b) if the vehicle is a motor vehicle that is moving-the vehicle is displaying a blue or red flashing light or sounding an alarm.
(2) Subrule (1) (b) does not apply to the driver if, in the circumstances, it is reasonable:
(a) not to display the light or sound the alarm, or
(b) for the vehicle not to be fitted or equipped with a blue or red flashing light or an alarm.