Unity 4 road making tool?

I have been looking for a road making tool for my scene but all I have tried don’t work, I don’t know if its something I am doing wrong but non of them say anything about working with Unity 4. Can anyone suggest a way I could make roads using Unity 4?

EasyRoads3D from the asset store (there are free and commercial options) looks absolutely amazing. I watched some of the videos several days ago and it seems extremely powerful:

Home Page

Asset Store Page

Something like that?