Nothing wrong with that road that a few Billion dollars of your and my money wouldn’t fix. Either bridge it out over the river so the rocks will fall between the road and the cliff face, or tunnel through the mountain. Slap on tolls (deep state loves those) and everyone will be happy.
Is it possible to bridge the highway along the river that way without the current putting undue pressure on the piers? Having it go across is one thing, but going along the river out in the water itself would present problems, correct?
I suppose you would want pilings similar to freeway overpasses, to let the current pass through, rather than solid, wide piers like you would see on a bridge crossing a river.
The tunnel would be an interesting idea, allowing the highway to be widened to 6 lanes like it apparently needs to be between the I-380 exit (PA) and where the six-lane stretch begins in NJ.