The only other place that I know of that has as narrow a raod as this is on the north shore of Maui in the Hawaiian Islands. Maps do not show a road there , but I have traveled it. And I am not talking about the road to Hana which is bad enough.
Fortunately the layout allows the opposing trafic the see far enough ahead that you can pull over and let them cover the distance between passing areas.
CD and Joyce Smith - Lily, Violet, and Rose
1999 Casita 17' SD - "The Little Egg"
2007 Escalade - 6.2L V8 - 6L80E Trans - 3.42 Diff