The one thing I wish people understood about "garage sale" and "yard sale" signs is that when they leave them nailed to stop signs, telephone poles, or whatever they can find after the date of the sale, it leaves the corners of our community looking tacky. They should remove the signs at the end of their sale.
It is a huge eyesore to see these signs, half torn down, weather worn, half ripped off, hanging sideways, from whatever they nailed them to. Sometimes the sales were months ago and no one has bothered to take down the signs. Probably they don't care or are too tired, but it should be their responsibility to remove the posted sale signs.
An idea I had was to charge these owners by going to the address of the sale with the sign and fining them. The city could make some money.