First up I have no problem with the power you guys are using, I was just pointing out a possible consequence to such use for those that had not thought it through, I don't think the cops would normally worry but if you have an accident?
Also I think the law regarding an un-road worthy car would not require their proving that the motor was in use, just the fact you were riding on the road with a bike that has a motor above the limit makes it a motorbike at least in OZ.
Oh and just to prove the Police may pull you over heres a cut and paste That I wrote in a velomobile forum last night:
"I finally got pulled over by the Police, it's only taken 7 months.
Someone reported a "motorised bike speeding through traffic", I suspect someone in a car didn't like getting blown off at the lights by a velomobile (the area of the report is all downhill on the route I take).
They had at least 3 cars out after me that I saw, the officer asked a few general questions like how is it up hill etc. then said he could see me pedalling as he pulled me over and he would tell everyone I was a bike, and to have a good day."
This velo is about as fast as some of your quicker e~ebikes (as long as it is not uphill

)