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All this talk about roads got me thinking about sidewalks. Anyone have ideas for that?!? I'm guessing something that needs to be 1/8th inch thick or so but soft enough to carve in blocks.
Stripwood. It's cheap, takes paint well, and it's already straight. Easy to carve expansion joints and round off for corners. It's also easy to use some sandpaper and sand some driveway cuts in. About 1/8" should be right but get a couple of thin strips in different sizes and see what looks better to you. About .15 inches wide should be about right for width. Check Michaels or other craft stores. You can sometimes pick up stripwood, basswood, or balsa cheap on sale. Any of those would work.
I'd try the craft foam for sidewalks too. Rough up the surface with some extrafine sandpaper and scribe expansion joints with an X-acto blade and a ruler. It's cheap to experiment with it.
Evergreen makes styrene sheets divided into tile squares that some sizes work for sidewalks. Easy to snap off, works like the plastics we are use to, not too expensive if you're not building a huge city. I add 4X6 strips to mine for curbs. Walters also make sidewalks as part of there street system. I got a ton of these with my Bachmann skyscrapers so use them in my Downtown area.
Korber Models made some nice ones too, good for smaller towns, they're not as wide. ***(A quick note: I yanked a Korber sidewalk out of a box of details and noticed "Man, this thing is thick," so I measured the thickness. NINE SCALE INCHES! Eek. For this reason, I really can't recommend Korber sidewalks. They're made of resin and would be ultra tough to bring down to a scale thickness.)