On my daily commute I have one roundabout which is really well designed. It enables the traffic to flow with one heavy traffic and one low traffic road.
What if this design with all the plans, documents, building plans could be open-source, so other communities can check roundabout repositories to look for solutions. Maybe it can be extended with extensive flow test data, so it makes the selection really straightforward.
Currently we reduce open-source to code repositories (and some text repos). But we should not stop here.
More things can be great open source objects: marketing campaigns setups, figma designs, miro workshop designs, business plans