YEAH!!!.....same thing happened to me on M4 East bound.
Just came out from e-toll cruising to uni about 90km/h.......the variable speed sign says 60km/h but everyone goes 90km/h. The just after the Silverwater road exit/entry......2 police people are standing there with radar gun!!!.......i braked and they started to write something.....FARK!!.......
But they didn't pull me over.....and no camera flash so should be cool!!.....now i can sleep.