Good one! 
But wait! It’s not a blur, it’s a rain 
drop on your windshield. 
Yes, I was thinking the same, but look at the sequence from here: https://www.mapillary.com/app/user/thewizard?lat=51.79335759999998&lng=5.258257400000048&z=17&pKey=2912874032380636&focus=photo
You see that the blur is disappearing and after the overpass the blur is again there 
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