I do like how everything but the tree is in motion. For me though, your image is very busy, and the interior of the car in the foreground is distracting.
You have managed to capture the tree well, however, the photo isn't very pleasing to the eye, the colours are quite dull, the foreground car is quite off putting. You feel cramped looking at the picture, just like I imagine the photographer was when taking it!!
I think this is panning in reverse. The object you are shooting should be moving yet kept in focus by panning ( moving in the same direction ) your camera. WAIT! I think I can see what you've done. I think I can see movement ( motion blur ) in the car you have taken the shot from. So have you been driving past and managed to keep the tree in focus while moving? My first thought was that you were in a parked car and mearly captured the movement of the cars behind the tree. Hmm, now what score do I give you?? LOL Good luck with this one. : )
Interesting effect. Would be better if you were following a subject in motion to get motion blur separation from the background, not shooting while in motion at a stationary subject. Would be better without the obstructions of the mirror, etc.