A very minor slipping hazard, probably less than posed by conventional steel manhole covers (etc). And by filling in damaged patches, the artist is removing a serious trip hazard. Why not complain about wet leaves in the autumn? They're far more widespread.

Oh no, I didn’t think about that!

You mean one tire may slightly lose traction for like 30cm? The car will be fine and will continue in the direction of its momentum. Pedestrians might slip, but there are always hazards and at least these are easily seen and avoided. Overall the works of art are a great improvement both physically as well as aesthetically

The artist filled in dangerous patches of damaged surface, and so improved safety by removing a trip hazard in each case (aside from two which were on walls). Meanwhile, the slip hazard is in every case shown probably less than posed by conventional steel manhole covers. I see someone inventing a reason to complain about nothing. The idea that a car would slip under braking is nonsense: any modern car has anti-lock brakes, and in any case each of those repairs would be under a single tyre for a fraction of a second, therefore posing no hazard to a four wheeled vehicle even without anti-lock brakes - and in any case, I think only one of the repairs was on a surface on which cars are permitted.

They're not even on the road

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For the dumbarse who downvoted. I'm expecting your objections for each part of my post.