I've removed the incorrect ref=B64 from Hobbys Yards Road at https://www.openstreetmap.org/changeset/162265114 - I also split the northern end at a likely maxspeed change (maxspeed change indicated on NSW speed data, but I don't trust that source enough to add the maxspeed value for the new way). I've left the maxspeed on the main section alone. Other ways not checked.