I think we get caught up in flo projects and forget about the real world infrastructure all too often.
So, while I love everything in that article (I’ve been a Shoupista for a long time!), most of these examples are more common-pool resources and not public goods strictly.
For a road to be an unambiguous public good, it needs to have minimum per-use costs and no risk of filling up with traffic. Many bicycle paths fit the bill. Each bike has no real wear-and-tear, maintenance is mainly from weather irrespective of amount of us, and bikes are small so only very rare situations lead to actual traffic problems.
We would actually be fine in the long-run with anything public-goods enough being at Snowdrift.coop… Here’s our statement we’ve had for a long time on this: https://wiki.snowdrift.coop/about/other-fundraising