#1, if u can go higher, take a shot of the curvy roads, with the streetlights also, and no other landscape. The streetlights will somehow be an offset of the light trails, but still maintaining the curves.
i want ot know the detail setting of first snap of road like AV, F value, AP speed etc because i have sony digital cam DSV but i never get this kind of result. I m not a prof. photographer but i like photography.