I'm left wondering, why is this here? Why was it translated in English, even.
I think that umarells are an interesting phenomenon. They sound like they were annoying construction workers (bikeshedding) but rather than treat them as a nuisance (loitering->fines or jail), a purpose was found: they get paid an honorarium for "jobs" most of us would find eyewateringly boring but provide value for the construction companies.
If you're lucky it elicites even some self-referential Statler and Waldorf comments.
For the curious: https://www.youtube.com/watch?v=4De2tMjPRCE