Well, with those photos you've left little to our imagination as far as why you like this road so much! :D
My favourite road...such a difficult question to answer. There's the Ring Road in Iceland, the MacKenzie Highway and Columbia River Highway in Oregon, the Alpine Loop in Utah, the Cabot Trail in Cape Breton, and all the roads in the Canadian Rockies....but perhaps the best road of all is the one not travelled...yet. :)
I have not yet been on any of those roads, but I hope to one day! I'm sure they're all incredible in their own right!