Victorian Numbered Regulations Victorian Numbered Regulationsr. 49
(1) The driver of a vehicle must give a right change of direction signal by operating the vehicle's right direction indicator lights.
(2) However, if the vehicle's direction indicator lights are not in working order or are not clearly visible, or the vehicle is not fitted with direction indicator lights, the driver must give the change of direction signal by giving a hand signal in accordance with rule 50, or using a mechanical signalling device fitted to the vehicle.
Note
Mechanical signalling device is defined in the dictionary.