That makes perfect sense to me, Keith. Very, very helpful! Very clever idea to give the illusion of black outlined roads when in fact it's just light on top of dark lines. (Now that you say it, I can't believe I didn't automatically "see" it right off!) This process would also work in non-vector programs such as Photoshop & GIMP. And thanks, too, for the layer rundown!
I have a couple further questions, if you don't mind:
So I'm understanding that you created your random shapes as a file, then turned it into a fill pattern, then applied it, right?
And you did in fact draw your alleys & sidestreets by hand, right? Was that as tedious as it looks?
I am interested in the reasons you decided to use a vector-based program; was it for scalability? From your sample maps page I'm guessing you mainly use Illustrator and only rarely Photoshop for your projects. Can you say a few words explaining why?
Finally, because you say roads follow the hilly georgraphy I take it you layed out the land before you began designing the city? Can you maybe say something about the composition process you follow?
Thanks for the input, Keith; very helpful!