To limit the probability of the use of inappropriate hardware, bars or fixtures, which could lead to an inability to identify doors or their position (open or closed), which could lead to collision, which could lead to glass breakage, which could lead to harm to persons.
To limit the probability of the use of inappropriate hardware, bars or fixtures, which could lead to an inability to identify doors or their position (open or closed) in an emergency, which could lead to collision, which could lead to glass breakage, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.