Original, but not too creative
The music is good, it is a good "road trip" type of beat.
However, the rest of the movie was a little lacking. You should have a progression in the background, not just the same shot of the rear view mirror. Secondly, although I can definitely relate to the bathroom sign, you should have thrown up some more signs, stuff you'd see on a road trip (i.e. food).
Could use some work, but not a bad theme.