Thanks Frito !! This and your photo album were very useful.

One important point needs to be mentioned (I may have missed it). At some point, bigger concentrations of population is counterproductive and will result in massive traffic jams, no matter how well laid out the road network in that small area may be. To avoid traffic jams, disperse population concentrations to spatially separated "villages" By that I mean separate your housing/heavily-used-entertainment concentrations into dispersed clusters on the map.

Adding one more block of housing to that complex may result traffic jams while placing a new housing complex in another location will avoid it.

One time I made the mistake of adding a sports complex into my pre-existing entertainment zone and had instantaneous gridlock rofl.