ArielVision Blurry Reflection
Blurry Reflection is a checkbox on the ArielVision Material Wizard
Here is a sample where the road is marked to have blurry reflection.
The final image, here after 500 passes, has a very blurry effect.
Here is how this is done:
After the first pass, these is just one single sharp reflection on the road:
However, in the second pass a second sharp reflection is generated - creating a choppy effect.
But after this is repeated, over and over, the final blurry reflection is created: