A visit from the critique club:
Of course you being the driver this might be a rather dangerous situation. I'm pretty sure they sell window clamp tripods that you can put on your window which would be a great thing to use for something like this.
Be sure to use a protective filter on the lens, because an insect can seriously damage your lens!
If anyone ever travelled by car long distances knows this is a familiar sight. Definitely meets the challenge. I can see what you were trying to do but I feel a better job can be accomplished.
The biggest problem I see with this photo is that the reflection in the mirror is blurry from a longer shutter speed. The motion blur outside the window is nice but I would think that it is secondary in this particular photo.
It would have been a better emphasis/fit for the Motion challenge. Another thing I would love to see is the face of the driver. Perhaps something of a sad/bored facial expression to emphasize the distances traveled.
Of course you being the driver this might be a rather dangerous situation. I'm pretty sure they sell window clamp tripods that you can put on your window which would be a great thing to use for something like this.
It's interesting to capture where one's coming from and the picture has nice movement. The image as such should be sharper though and the motive in the rear mirror doesn't really inspire (it's just a piece of road...).