I'm looking for a good, minimalistic way to convert a google map portion or scanned city map into a neat, simple vector map that I can scale to my needs. I have the latest Illustrator and have found a tutorial I like. However, the tutorial uses layer styles to bulk-style the streets I trace. The problem with this is I would like major streets to be slightly bigger, like in normal maps. Any tips or other tutorials that anyone has for modern city map raster to vector conversions?

testMap.png