@walk_sydney oh just switched my brain on to the Bs. Which bridge is B4 exactly? IMO there are 3 active transport bridges 'missing' in the Wolli Creek area: one paralleling the train line from Wolli Creek to Tempe, and two paralleling the sewer line on each side of Earlwood.
(I wrote a piece about those two once, though I've moved on from these particular accessibility metrics, the idea is the same https://blogs.unsw.edu.au/cityfutures/blog/2021/08/impact-of-pedestrian-network-barriers-on-walkability-a-cooks-river-case-study/ )