Im with BEagale on this one its just another way for the insurance companys and the big airport operators to get out of paying up if you have an accident.
At night on a busy airport ramp I can see the need for the things but the people who mince around in them at small GA airfields in the daylight just look like pratts.
To those of you who are victims of the self serving safety industry at the big airports ( cranfield comes to mind ) you have my simpathy in being forced to use these things even when the conditions quite clearly dont require it.
However see it as a social service , you are keeping these "safety officers" in a job and off of the streets because clearly they are unemployable in any other industry.