These are the new bus stop locations, the old bus stops are just next to Fourth Road.
Please see note/4928603 for details.

Fixed on changesets 171675905 and 171676614.

Don’t worry for this as I’ve got all the relation numbers for those, will perform a partial revert in later time with the original configurations.

What the point for deleting the Southern River extension trips for the route 214 as those trips still exists on PTA data and Transperth website?

The public_transport=stop_position tag shouldn't be added to the bus route relation as it will reporting on the OSM Inspector as an Unknown role in a relation.
Please see osm.wiki/Buses#Adding_bus_stops_to_the_relation

Transperth's Spatial Data tells who's operating with those bus routes around areas in Perth and its regional areas.
https://www.transperth.wa.gov.au/About/Spatial-Data-Access

okay got that, as the newly built road is very close to the Railway Parade intersection. :)

Looks like the road next to Bayswater Station is connected directly to Railway Parade rather than Rose Avenue by survey outcome.

Just wondering is there a way to tagging with the CAT ID number from the CAT services in Perth area (I've used "ref:AU-WA:PerthCAT" as an example), if it's okay I can do the same for Joondalup and Fremantle area as well.

When attempting to split up the road segments, it needs to take caution which node to be split up to avoiding the route to be invalid.

Seems this bus route is mixed up with route 270 and 280 together.

I've fixed in the changeset/119093707.
changeset/119093707

It's provided by PTA data file, and it's adopted using the nearest street names.
https://goo.gl/maps/fQSztFoaiA2o6iHx9

While adding the areas please do not snap over to the road. It's hard to add the relation onto the road later such as bus routes or cycling routes.

For those areas, it is not a good idea to overlap or snap their boundaries onto the road as it becomes harder to pick up the individual road to add or modify the relations such as route number or bus routes as example.

Drawing an area overlapping onto a road boundary isn't a good idea as some editors may pick up an area instead of a road to editing for the tag or relations such as adding a road route number or a bus route as example.

For this edit, please create a new node to entering the store details. Please do not use any existing nodes with different types which can causing the relation conflicts with a existing bus route.

A new node had been created where resolves the information that entered before.
node/7283687944

Anyone have updates for this section of the road? Seems the works had started a month ago and there's a roundabout in this location.

Just removed the tag while it is defaulting to oneway when it is a roundabout.

Here's the newsletter regarding to the closure of this section.
https://project.mainroads.wa.gov.au/northlinkwa/Documents/Traffic%20update%20-%20Gnangara%20Road.pdf