So I plan on creating an animation involving the Nurburgring, I have outline the inside with a Bezier curve. Here is what it looks like.

My question is how do I get the curves to extrude over the road part of the track? I can get it to fill the middle portion. (But it only has 1 face/vertices). If I need to go back around and do the outside rather than the inside of the track I still would like to know how to extrude it to the length I would like while also having it be a plain instead of a cube or cylinder, etc..
