Instantiating a road at different angle

I'm having a huge problem here, I have no idea where to start on it, I'm trying to create something like a road, left side and right side are same angle, for example take a space ship which flies forward, I want the road to sometimes get curvy, sometimes turn the angle left or right, but how can i do it?

I thought of something like a cube that goes up and changes it's angle and direction and little which makes it create the road differently... but I don't know where to start.

http://prntscr.com/7cnv14

Something like the image above. could anyone guide me and spread some light on this... been trying for 3 days without success

 

If you want a procedurally generated road, then you want to create your own mesh and supply vertex, face, uv and material data. If you want a pre-built track, then I'd go to an external modelling tool such as Blender if you want a free option. Then just import the FBX you export from Blender. Or, maybe you could try this free Asset Store package to get you started, but it's only something I've messed around briefly with. Ultimately, you'll want something a lot more specific to your needs as per my first suggestions.