Connects two countries, but only one state.
The highway existed at least as long ago as 1955, and possibly longer, as it was the only road access to XXXXXXXXXX until completion of the XXXXXXXX Highway in late 1955. The highway is closed in winter, and is hard-surfaced with Bituminous Surface Treatment.
The highway is so named because, along much of its length, it skirts the crest of the hills, giving looks down on the valleys. It is also one of the most northerly highway in the world at those longitudes.