Judging by the gate in the foreground im assuming thats also an airport road which goes through the parking area?
Unfortunately these days it has gotten to the point where signs HAVE to be erected everywhere for peoples “safety”.
Common sence is a thing of the past and thanks to the every increasing attitude of most people that “Its not my fault, so i’ll sure someone else to make them culpable”.
When the first “new” cessna 182 arrived in the country (2002?) I had to laugh at the dozens of new “warning” stickers all over the cockpit and cabin.
All in order to avoid being sued because someone forgot to wear a seat belt… or check fuel for water….. check engine for oil!!….. make sure fuel is in the ON position…