OK - no problem - I've had a quick read to that doc, and I think the reason for the misunderstanding is that the other roads in the area - such as Beaumont Rd are classified as Secondary, but are probably not. So not an exact science.
My motivation - as you might have guessed - is that I organize cycling rides with two groups in the area using RideWithGPS, and find it frustrating when the map data is incorrect.  One group loves dirt & gravel, the other can only use asphalt! 
Also there is a new cycling track that is being constructed from Mt Torrens to Birdwood along a disused  rail track, which is extending the Amy Gillett bike path.  how will this be added?
Thanks for your help with a newbie, but you understand that I was a mite upset to see all the surface changes, which initially took a bit of time to work out how to achieve, just wiped! :-)
I'm getting the hang of it now and will lay off the re-classification s#it... :-D
