way/734194844/history has bicycle = yes|yes|no|no|yes|no

Was it supposed to be bicycle:lanes ? And be per-lane tagging?

is this highway definitely closed? and if so, is access physically blocked?

unknown

The speed limit for High Road is 70km/hr from Leach Highway to Nicholson Read, with a possible 40km/hr zone during school arrival & departure (between Meadowbrook Drive & Belvedaire Way)
School zone
40 kph on school days
7:30–9am and 2:30–4pm (or as per signage)
https://www.police.wa.gov.au/Traffic/Road-safety/Road-Safety-Information

This area should be a small park with a footpath through the middle

wikidata suggests, that there is Arthur River here. Maybe the Blackwood River is badly named. Please check.

this is a private driveway by the looks of it

deleted

This area is Sid Eaton Reserve