some photos of relation 2347837 are on https://www.mapillary.com/app/?lat=-37.628130559916&lng=145.53460105&z=17&pKey=466024774694168

yes
the longest route in Australia is relation 176684 (www.openstreetmap.org/relation/176684)

the route is too long to fit in one relation; so it's split into 4 member relations - 2347837, 2347838, 2347839 and 3391145

mtb=yes removed on 31/7/2023

I agree

A golden rule of OSM mapping is "When in doubt, actual field survey is needed". So don't change anything just by imagery.

Based on Bing, you think the cycleway near end of Whitefield Rd is actually the Whitefield Rd. From Google Earth, It seems to me the cycleway and Whtefield Rd are 2 separated tracks; and that it is a path rather than a cycleway.

So I won't change it, unless I go there and check it, or a local resident can verify it.

I have not been to that cyleway nor Whitefield Road. I didn't add the cycleway and the Road.

I'd ignore this warning as that road and cycleway is very close to each other at several other sections; for example, 160m east of the end of Whitefield Rd.

Mr armchair mapper, I insist my original cycleway is correct as I rode my bike on the cycleway from start to end on 16/11/2018 And I took photos as I rode. See www.mapillary.com/app/?lat=-37.9422361111111&lng=145.5002277777778&z=17&pKey=lykQ41d4DeyOpcD4XmEetg