New Road Law – Victoria
This is already the law in South Australia

The Victorian State Government has announced that from 1 July, road users will need to slow down to 40km/h when driving past stationary or slow-moving emergency or enforcement vehicles with flashing red, blue or magenta lights, or sounding an alarm.

Emergency and enforcement vehicles include police, ambulance, fire services, State Emergency Service and heavy vehicle enforcement vehicles that have magenta flashing lights (such as VicRoads Transport Safety Service vehicles).

When emergency or enforcement vehicles are displaying flashing red, blue or magenta lights, or sounding their alarm, drivers must:

Approach at a speed that allows the driver to stop, if necessary, before passing the vehicle and give way to any emergency or enforcement worker on foot in the vicinity;
Not drive past or overtake the vehicle at a speed of more than 40km/h;
Not increase speed until the driver is a sufficient distance past the vehicle to not cause danger to those workers in the immediate vicinity

Location

Australia