what's my track different from a simple box, this is what I don't understand. Do you find the rendering above satisfying?
Here is how xNormal parallax looks like:


The wheels literally stand out from the background in the right direction, according to camera, not to mention the bump lighting on the wheels.
The diffuse texture is not the same but it doesn't matter anyway. It's a geometry issue.
Sometimes areas of wheels are cropped and gaps between the wheels can be seen but I couldn't ask for more from parallax -- it's not real geometry.