Terrain Road from Skechup

Hello,

Im really new then it come to Unity and Sketchup but useing Sketchup 8 pro to maker 3D models to my gameworld in unity 5.4.
I just made a Terrain world 5x5km in unity and want to apply my road from SketchupI made,
But the thing is the road is flat real flat and have really no clue how to make it follow my terrain, tryd google for hours and all i found was quick line like make it "Poly" and "follow me" but cant say it helps me much,

Nevermind Cant find the delete but Changed to blender in hope it will work better with unity, thanks anyways