Constraining the Car to the Track - 3

I have reconsidered again and I start even simpler, not with two triangles, but with a plane containing the line defining the track segment and with an inclination in the middle between the inclination at the start and end of the segment. I think it is worth it to at least implement it and try it. If it works, great. If not I have at least written some additional functions for the geometry objects and those will be of use in the future. I already have the planes created and now have to add the intersection function. That should give me the intersection point of the ray straight down from the center of the car with the track segments. I will then calculate the distance to the line defining the segment and should be able to determine, if the intersection point is on the track.