Not as bad as Germany by any means but for rear guard I believe it TECHNICALLY has to cover 45 degrees to the rear (varies state by state) but heaps of people have tail tidies and get away with it.
There certainly has to be a rear guard and the number plate has to be displayed on the central axis of rear of the bike, and illuminated. So that means under the seat. No side mounts or any of those possibilities here. Also there's a minimum separation of rear indicators, same for front, minimum mirror sizes, all sorts of shit.
Any exhausts louder than stock are banned and there are cops who hang out and book everyone they can find. One local guy has about 90% of his noise tickets challenged and rescinded but that doesn't stop the prick.
The one good thing is here in Queensland we don't have any MOT equivalent so can often get away with things which may not technically meet the law (after market LED and HID headlight bulbs, smaller than stock indicators and mirrors etc).