THE SAFETY CAMERA FLASHEd !!!!!

[gtfpv]

coming home after work tonight , i went through a set of lights on the green which has just been upgraded from a red light camera to a safety camera , i thought this was a 70 zone , however i went trhough at over 60 and under 70 . not sure because i didnt look at the speedo until i seen a flash in the rear, but the dial was about 1/2 way between 60 and 70 when i looked, i never braked either . . anyhow my question is this . THIS WAS a 3 LANE ROAD, and i had 2 CARS right next to me , so the 3 CARS went through together, i dont know if we were all doing the same speed though . if i get booked how can i be sure it was my car the cam picked up . ?????
2ndly about 100metres past this intersection there is a 70 speed sign (NSW)
I thought there was a 200 metre rule or there abouts in relation to speed cameras and changing speed zones .
3rdly . what is the minimum fine and points loss for speeding in nsws.
4thly . i havent been booked for speeding for 15 years !!! i'm diliegent with speed at all times , i spend 3 hours in the car each day travelling the same route and go through 4 fixed speed cameras each way daily + mobile ones too . i feel a little dissapointed if i have been pinched under all of these scenarios ??
can anyone answer these questions for me and give me some valid ADVICE PLEASE ?