One of my pet peeves is signs that stay up way longer than they should: political candidates, those wheatpaste ones by ANSWER Coalition for protests, and so on. They start out being helpful, but eventually just end up as litter -- and often with ANSWER and the like, they advertise protests that happened years before.
The law states that today is the deadline for signs from the most recent primary elections, and further adds that no sign can be up for more than 180 days. However, there are still a lot up around the area.
If you see a poster, the city asks you to call 311 and report it. I'm going to be on the lookout, these things drive me nuts. The offending campaigns (and protest groups) face fines starting at $150, up to $2000, which hopefully will get them to take them down.
Photo from 2010