Hi Anthony! It should be working in the day and at night and is triggered when someone beats the red light. They are usually painted in bright orange with reflective strips as well.
As of 2018 December, there are 240 of these cameras in use, it surely pays to pay close attention and slow down when approaching a traffic junction. Likewise, with the harsher punishment being implemented from 1 April 2019 onwards, red-light offenders will be given 12 demerit points, a $400 fine for cars and $500 fine for trucks.