In the same way, for SC5, roads should be like this (And the game automatically creates natural curves and sidewalks to go with it). Zones would works the same way, automatically aligning to the road. Lots would be automatically created based on what the land value is, demand, and the size of the zone, and would fill up with objects to look right. This means you could make houses with large backyards, apartments with fields, or skyscrapers on the sidewalks edge.

Also, since the game uses a 3d engine already, it should consider height in respect to say placing roads under bridges.

The game should smooth out heights more naturally, and houses and buildings should cut into hills instead of making really stupid looking brick walls on lot edges.

Finally, with how many bugs sim city 4 had, I’d like to see the game more thuroughly playtested before the initial release, whatever the pressure may be from EA for money money money money.