when you design a community. Open space between homes. Where a road is crossing over a stream, a pedestrian path is going under it along the stream. Through parks. Elevated pedestrian bridges over big highways. The junctions between the two are few and far between, like at major intersections where traffic lights and crosswalks provide some safety.
The more I see this kind of approach in modern city design, the more it makes sense. Drivers don't like bikes, and bikes are too dangerous to be riding in bike lanes. Bikes and pedestrians can't really co-exist easily on sidewalks, nor especially electric scooters. The answer is that bikes and scooters need their own independent system.
Obviously that doesn't help for older neighborhoods all the time, but we can do better moving forward. And sometimes I've seen it CAN work with older areas when they tear down and rebuild, for example turning an old railway line into a trail.