I hope that the road in the first picture is "One Way" and that way is up. Yikes!
There have been many roads like that in California. The uphill traffic has the right of way and downhill traffic must back up until they find a place wide enough to pass. The drivers going either direction must honk at all blind curves to let the other drivers know they are coming.
I have also found narrow roads which had time limits. Vehicles going in one direction would travel at odd hours and those going the other direction at even hours.
I wonder if that photo is of the old Mt.Wilson toll road?
Bill, It was on that very road that the term "testicular fortitude" was coined.