I re-drove the old Lewiston Grade (aka, "The Spiral Highway") in Idaho a couple weeks ago. Dad used to drive the old road 50 years ago on trips to visit family. The old "guardrails" are still in place -- short wood posts with three strands of wire rope. This was LONG before the introduction of prefabricated metal guardrail. But the wire rope guardrails were a huge improvement over the first guardrails...