the thing here is that you mentioned flashing lights. are you talking about the flasshing 40 led lights? If those signs are were activated it is done so by the Vic Roads guys and it is done automatically so its irrelevant what time the cop had in that case.
i actually work for a company who builds and installs those signs amongst other things. We are lucky that the government weren't allowed to put speed cameras in them like they wanted to!
and finally, i got the key that turns them off! HAHA