Topic shift...
I was at Recruits, playing Ambush Z and noticed how nice the city's streets looked. Shawn of Ambush Alley Games told me a super cheap, but great looking way to make street terrain:
Go to Lowe's or some equivalent hardware store.
Buy a roll of black drawer liner...the rubbery grip kind. It comes in a 12" by 6' roll for something like $4.
Cut it out to fit whatever you want to do...streets, intersections, parking lots, etc.
Drybrush some like shades of gray onto the strips to create tire wear and use a fine point pen for cracks.
For lane lines, he used white car pinstriping you can find at just about any Wal-Mart or car parts store.
Voila! A ton of roads for under $10!