Attached Link: http://www.renderosity.com/viewed.ez?galleryid=84885&Start=1&Artist=Cowboyuk&ByArtist=Yes

You could always try making the ground plane the road then create terrains and place them around where you want the road to go. When you create the terrains, use the clip function to round off the edges,and then place grass,etc around to create the look, that's how I did the corner on this pic. May not be what your looking for, but, it may give you an idea.