here is a link for making new tracks for the XNA Racer Starter kit http://www.bia-gamezone.com/ i figured out how to make new tracks with the help of MR.Benjamin
i use XNA Game Studio 1.0 still available at microsoft and used the Racer starter kit 1.0 And 2.0 to make new tracks, in 2.0 there are the TrackImporter.cs And the UnitTest.cs i imported in
Racer Starter kit 1.0 and there it wash a new track, you can later on import it in Racer starter kit 3.0 for XNA Game Studio 3.0 or 3.1 it is just to make new tracks and there is a port for Game Studio 4.0
https://github.com/Pepsi1x1/XNA-4-Racing-Game-Kit Hope you like it