I assume the sheet of paper is US Letter, which would mean one side is slightly larger than 11″.
Thank you for taking the time to do the measurements.
We didn’t measure the meters, but from the pictures they seem tall enough to be a makom patur. The question we have is how wide and deep are they? If they are too big, then they could be a reshus hayachid, in which case it would be forbidden to place anything on them while in a reshus harabim.
yes, but because a fire hydrant is between 4 and 10 tefachim high, it is in a different category compared to a parking meter. As there are fewer parking meters around, we are trying to determine the size of the muni-meter to see if it is also a makom patur.