I go simpler, like some others above...I have a bunch of leftover asphalt shingles and portions of shingles from a (real-life) shed roofing project. They have a texture that seems scaled appropriately (they are actually asphalt LOL) and they come in various blacks and grays. Reasonably priced if you have to buy them, considering one bundle is a LOT of 1/48 roadway. Easy to cut and put down, not too thick, easily weathered and they accept paint (for road lines) well. Note - you need to get the loose "pebbles" off in advance or it's a little messy.
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