Think my roads would have to be:- The Stelvio Pass in Italy, Transfăgărășan Highway in Romania, Monaco Grand Prix route, The Overseas Highway in Florida, The Iroha Zaka in Japan, The Lysebotn Road in Norway, The Jebel Hafeet Mountain Road in the United Arab Emirates.
One of the greatest roads I have been on was whilst on holiday in the French Alpes at Courchevel 1850. The roads were very bendy but the scenery was awesome!