There are instances where the safety signaling is so poorlynimplement d thstbut may cause about as many problems as it solves
This particular signage and dignalnis like a "pop quiz." for motorists. In that particular environment, you will find a lot of people ignoringnyge signage and trusting their senses instead, a reasonable and defensible action. So please send this one to the traffic design engineers as well as the road maintenance department.