What is remarkable about this?

Not only were they parking chairs, but they were also construction notices

It looks like they went through the city to get the no parking signs and are potentially removing junk from a house they just bought. I did the same thing when I moved into my home and needed a place that the Uhaul could park while we unloaded. Not everyone has a garage or driveway, and it's impossible to guarantee a spot outside your home if it's on the street otherwise.

those are official city of Pittsburgh construction notice parking chairs.

Yes; I believe you can apply for them through the 311 app. /s

make sure to check the "I need official city parking chair" and write the correct # in the box next to it. it's 1 chair per 5 feet. round up to the higher #.

Sidewalk chairs are for saving a spot for the parade. Parking chairs must be on the street. Those are not to be honored.

This is higher class than the official city of Pittsburgh notice taped to an orange traffic cone that's put in the road one foot from the curb, tho.

These look like actual dumpster permits taped to the chairs so you could get towed for ignoring these.