I like the shot just as an image outside the challenge. I think cropping a little looser might better convey the sense of speed. I'd also try cloning the color of the main rail all the way across to get rid of the little bit of green, but that's minor.
I like the idea and the tilt too. This is a tough one, I am sure the driver is concentrating but it seems hard get the whole feeling, just my opinion not to worry I am not voting :). In a lot of cases I think breaking the rule of thirds works but in this time I think it may have helped to atleast not have the head centered. Kudos though for coming up with a photo that faces forward, not backlit and still able to show emotion.