Quote Originally Posted by Rrumbler View Post
They will most likely wait until traffic is at the lightest, close the highway and set up an appropriate detour, then load, shoot, and muck the dross, and re-open the highway. They quite often will do this at night. They drilled the holes at a more convenient time, or when they had the drill rig handy.

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That's what I would have expected; I could have understood that, but these cuttings were excavated back to the shot-holes.
When a hole is blasted, the surrounding rock is fragmented...but these holes were clearly delineated, eighteen to twenty inches apart and twenty to thirty feet deep across the entire face of the cutting.
They'd never been shot...