Thanks frx026 for clearing up this issue, so i'm able to be less paranoid then...
Recently (when i still had my supra),
was on a supra cruise, then at the hoddle/victoria st intersection, there's this right turn arrow that is variable, in the afternoon, it lets about 8 to 10 cars pass, but that night it only let 4 cars, out of habit, i went past, not realising the light had turned, but another car next to me went forward to, we both got flashed, but its been 3 or so months and still no letter, i'm guessing it works the same for redlight cameras too?