>In an organic layout there are central roads that go to places of interest and the smaller streets flow to the central roads That doesn't sound organic, it so

>In an organic layout there are central roads that go to places of interest and the smaller streets flow to the central roads That doesn't sound organic, it sounds like basic transportation planning and street hierarchy: https://en.wikipedia.org/wiki/Street_hierarchy https://en.wikipedia.org/wiki/Street_hierarchy. Smaller roads flow into bigger roads which flow into main roads which flow into highways. "By contrast, in many regular, traditional grid plans, as laid out, higher order roads (e.g. arterials) are connected by through streets of both lower order levels (e.g. local and collector.) An ordering of roads and their classification can include several levels and finer distinctions as, for example, major and minor arterials or collectors."