That's such a great visualization ! Straight to the point. Adding to the above comments, if this current body texture was to get scaled down to 1024*1024 (for instance if an hypothetical game was to be set to medium settings, or as the texture gradually loads and mips up during a cutscene), this is all that would be left…
I would model the intersections beforehand, and then create the roads with modeling a section and extruding it along a spline (which you can create on top of your plane mesh as reference), connecting your roads to your intersections should require a simple bridge at that moment.
@maxim3d You're welcome ! On navigation : honestly this video showing the spacemouse/spacenavigator in action is a reminder that even though these devices definitely have some uses for presentation and can be a decent input device for people not used to Maya-style KB and mouse, it really isn't a time saver at all. I find…