Roads...
I think the question that's already been asked is what type of roads? My layout in the early 1950s does not show a grat deal of asphalt. many of the major roads and minor roads were cement. So I just smooth some plaster on, paint them grey, and add tar line separations with a No.2 pencil, and I've go roads. Dirt roads is simply a brown wash over a not so smooth plaster (try and show tire tracks) and you've got dirt roads.
KISS, Allan