After fielding questions, on a regular basis, about their deer crossing signs, the Iowa Department of Transportation had to speak out.
So, to make things clear they took to Facebook to spell it out:
Question: Why don't you put these signs where it is safer for the deer to cross?
Answer: Deer can't read signs. Drivers can. This sign isn't intended to tell deer where to cross, it's for drivers to be alert that deer have been in this area in the past.”
Source: UPI