Inaccurate speeding fine: What can be done?

[Woz]

Alright, I have a bit of a dilemma.

I was driving down Eastlink yesterday afternoon in a work truck, cruising along without a drama when this little, green Camry came flying up behind me and hit the purple flashers from behind the grill. VicRoads!

Pulled over to the side of the road, jumped out to see what was going on and the first thing the bloke said was "Is this thing speed limited?" My answer: not that I know of. Next, he explains that he caught me doing 119km/h in a 100 zone. $227 and 3 demerit points. Wasn't interested in saying, or listening to, anything else.

My problem? There's no way I was doing 119km/h. Not in a fully loaded bitumen truck on flat ground. I admitted that I may have been doing over 100km/h (over the last few k's the speedo had floated from between 95-105), but the needle never got to, or went past, 110km/h.

Yet, somehow, this bloke reckons he followed me for 3,008m at an average speed of 119km/h. An average speed? Which to me says that I either sat on 119km/h the whole way, which would have most likely meant me getting backhanded by the truck operator sitting in the seat beside me, or I gave it one hell of a squirt that saw me float from 100km/h to roughly 138km/h with 119km/h being tucked neatly in the middle (therefore = average speed). That's how I see it.

But with over 9tonne of gutless Isuzu, on a flat section of freeway, 138 is nowhere near reachable. Ever. With our trucks being driven to every corner of the country, blokes have tried. 120-125km/h is roughly top speed in that sort of scenario. And that's fighting hard to get to that speed.

Yet, this bloke wasn't interested. 119km/h was his speed. Detected and alleged. $227 and 3 demerit points. If I'd been fined for doing somewhere between 100-110km/h I wouldn't have even worried about the fine, just paid and gone on with life. But this fine is absolute rubbish. Now, being in a work vehicle, this has presented a bit of drama.

My question is this: What can I do to argue it? It's not right, I know this. The bloke sitting beside me knows this. The bloke from VicRoads wasn't interested in listening to a word either of us had to say. I also didn't think to ask to see any reading or anything until today. Now, I'm a little bit stressed trying to suss out what can be done.

Little help?