>>7608699
Continuing with an example. I don’t think conventional blurring helps give a crisp sense of speed. like >>7608744 suggested, blurring by hatching feels like the best approach. My example uses a pixel sort effect on the contours, applied only along the x-axis.

The real challenge is figuring out how to apply something like this in traditional media in a reliable way. I’m thinking of using a piece of torn cardboard with dry ink and conventional hatching.