Utilizing openstreetmap data, you can find the curvy roads you want to carve up thanks to Adam Franco's project curvature.
https://github.com/adamfranco/curvature/wiki
Curvature will output KML that can be viewed in google earth, or whatever your heart desires to do with KML. He has even provided pre-processed files if you do not feel like figuring out how to use the software.
For the techno-dorks: curvature is going through a refactor and I believe is nearing completion. I'm not sure how far along the refactor branch is, but it may be worth trying if you intend to do large sections of map.
https://github.com/adamfranco/curvature/wiki
Curvature will output KML that can be viewed in google earth, or whatever your heart desires to do with KML. He has even provided pre-processed files if you do not feel like figuring out how to use the software.
For the techno-dorks: curvature is going through a refactor and I believe is nearing completion. I'm not sure how far along the refactor branch is, but it may be worth trying if you intend to do large sections of map.