Thanks, Surveyor2503, for adding the bus stops to the map! I updated bus route 570, converted it to public transport v2, and added all the relevant bus stops to the route I could find (according to PTV). The terminus at RMIT might need some verification. 

Bus route 570 relations are now:
https://www.openstreetmap.org/relation/2721424 (to RMIT)
https://www.openstreetmap.org/relation/11671207 (to Thomastown)
https://www.openstreetmap.org/relation/11671208 (route master)

In case you need resources to figure out how to map/tag valid bus routes, I found this helpful:
https://www.openstreetmap.org/user/Warin61/diary/45106
https://wiki.openstreetmap.org/wiki/Buses