M8 Rozelle tunnel camera,

I’m talking about the camera in the tunnel that goes from Gladesville rd, to rozelle and right towards the tunnel which connects to city.

In a usual 60km/h zone,
I was driving 58km/h specifically cuz I was in cruise control.

But the speed sign on the roof showed 40 which I realised like 100m past the camera.

I slowed down after as expected but am I cooked?

It was at like midnight and there was one other car next to me which also slowed down later with me, and there was no sign or other warning nor construction or anything.

There was also no flash either but, if I get done by this, I am royally fucked.

Any advice?