Last winter I got caught by a construction sign laid flat in the middle of the bike lane with the legs of the iron stand spread completely across the lane like a V-shaped trap. I hit it in the dark at about 15 mph and wiped out good, destroying my front wheel. The construction company was very responsive when I complained. They paid for a new wheel and never left the signs like that again. You could try contacting the builder - they just hate the thought of personal injury lawsuits. No need to threaten them. Just explain the problem. Who knows, maybe they'll move the signs.