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I'm being era-specific because of the great differences in both road striping and road width some 50+ years ago. So if you model the late 40s to late 50s, I'd like to see what you have, paved and unpaved.
Not much to it really. I build up the road with plaster and paint it with a flat gray house paint. While the paint is still wet I spread on some light gray non sanded tile grout and some N scale blast along the edges and let the paint dry. Then I drag my fingers across the road in the direction that traffic would travel to smooth it out. Then wet it down with 70% rubbing alcohol and then wet it with Woodland Scenics cement. Then I’ll go back and lightly dust with some black from an airbrush If I want to make it darker.