Just a quick note to let you know that these sandwich- boards that pop up along our sidewalks like magic mushrooms every weekend are illegal. (However, after I got this pic home and took a look at it, I realized that the green can on the right bears the name of the Queen of Queens Crap. Rather appropriate that the Katz name appears on a garbage receptacle, but nonetheless interesting, considering this was taken at the corner of Queens Blvd and Grand Avenue, which is not within the confines of her litterbox. Why is the Department of Sanitation providing free advertising to politicians?) Anyway, the best place to put these obstructive signs, should you come across them, is inside a trashcan such as the one shown.
From DOT's website: The Department of Sanitation enforces for: "A" Frame Signs, (718) 714-2730
And it's clearly stated in the Sanitation codes under "sidewalk obstruction."
The form for reporting violations is here: Obstruction on Street or Sidewalk or call 311.