Water processing artefact

I noticed an  image processing artefact involving something like a sine wave in the previous post. Here I notice a water processing artefact, involving more waves.

What appeared to be a steady procession of small waves of water running down the road outside our holiday cottage in Holne. It was raining at the time and the snap may have been taken through the window of the car, which may account for the waves not appearing anything like as clearly here as they did at the time.

With wave fronts which ran across the road and which were separated perhaps six inches, one from another. I think not transverse waves in the sense that a physicist would use the word, as water is flowing down the hill, down the road, it is not just bobbing up and down, as it would be in waves out at sea. Not sinusoidal either, with the peaks well separated and with no apparent troughs.

So what is it about water on roads on hills which generates waves of this sort?

Not unlike the ripples of water you get at the edge of the sea on a very flat sandy beach. From where I associate to the ripples of sand which sometimes get left behind by the sea, ripples which are much more sinusoidal. The sort of thing which was included at reference 2.

More puzzles. But at least more evidence of the ubiquity of waves.

PS: and on the full screen version of this snap on my laptop, more image processing artefacts of the previous sort on the cattle grid across the road, top right. Barely visible in this post.

Reference 1: http://psmv4.blogspot.com/2019/10/image-processing-artefact.html. The previous post.

Reference 2: https://psmv4.blogspot.com/2019/07/ryde-buoys.html.