The materials it's made from will always vary, but gradation, specific gravity and what it achieves for compaction, at optimum moisture content, (95% or better compaction) is a material that would be acceptable by a state's DOT engineer for sub base for a roadway, that would typically be the desirable material for a driveway. Take NY DOT approved Item #4, (what it was called for years) look at the gradation for it, so much percentage of a range of sieve size aggregate passing, all the way down to the fines, is how it's analyzed. It's a structural material, no clean washed stone is going to be structural, the same with sand, there is not enough of the range of different sieve size passing to create the correct density to achieve load bearing compaction at an optimum moisture content. I believe that although most of the NYS Item #4 I have dealt with was always processed from a stone quarry, it can be achieved from screened run of bank material. I worked for a small outfit that rant this material from a gravel quarry on their property that was some pretty good material once screened. I used it for structural fill, worked great.
It's going to be similar in gradation, just the natural materials will vary by location, best to use whatever the local DOT approves for roads. Same is true for concrete, DOT approved is often specified in construction specs, for a given compressive strength, because it's a tested and proven design for that material, wherever it may be sourced.
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