The LA and Orange County region is wild. Basically the big LA basin (and the OC flats) are almost fully developed, add the San Fernando Valley which is also there in the City of LA. Also in LA county, the additional development on the Antelope Valley and add the growing Inland Empire counties and you have maybe 7 separate regions bordering each other forming the one mega region. Not only is there a mega region but all the subdivisions are pluricentric with several major centers not just one singular center of gravity.Yeah, L.A. has a very different topography than most cities in that it completely fills a geographically constrained basin, with very little outside of that area, but contained within it are multiple large CBDs. The freeway system there reflects this in its lattice-like appearance, as did the old Pacific-Electric network. The modern MTA rail network, both as it is now, and as it will be 15-30 years from now also follows the lattice design.