"Quarry Product"--basically unwashed, dirty crushed stone. It has great drainage and friction properties, better than crushed stone so it stays where you put it, and is cheaper as well.
What I did was search out an independent engineer and found one who specialized in road building. He was super-knowledgeable about all the things you are asking about and a great guy.
The $600/$700 I paid him was cheap at twice the price!
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