The name "Ryuhaku" sounds rather cool, but after researching it, I found out it's simply a name derived from connecting "Tappi" and "Kodomari (domari=haku)" .
　I still prefer the explanation that it's called that because "it looks as if a [Dragon is staying here]."
　Driving this road is truly dramatic; you traverse a winding road then suddenly the deep blue Sea of ??Japan appears below.　(Nihedon @ KesaranPasaran Lab)