I used SketchUp plugin Instant road to make this road. I hope someone will find this tutorial useful.
Youtube link:
http://www.youtube.com/watch?v=CblbmoDvTrk&list=UUAVZtVcHCjD9lkgVvYnRCHg&index=1&feature=plcp
Youtube link:
http://www.youtube.com/watch?v=CblbmoDvTrk&list=UUAVZtVcHCjD9lkgVvYnRCHg&index=1&feature=plcp