So that when you look in your mirror, it's easy to recognise the vehicle such as Ambulance, Police car.
Flashing red lights on emergency vehicles always take precedence over signs and traffic signals. In construction zones, signs related to the construction take precedence over other signs. If a policeman is present, either stopping vehicles or directing traffic, his or her directions take precedence over signs and traffic signals.
Emergency signs are in green. If you see "Emergency exit" signs, or "Emergency eyewash" signs etc.. They are always in bold letters and green.
Luminous signs are easier to find when there is an emergency.
It is not vital for safe driving, but is helpful. Being that all of the warning signs on the road are in written form or use symbols, hearing impaired drivers can easily understand them. The problem with being hearing impaired and operating a vehicle is that you cannot hear the sirens of emergency vehicles.
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the word exit.
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One may purchase a number of emergency signs from sites such as Amazon, eBay, and safteysigns dot com. The prices are easily affordable and transactions are instant.
The signs are from people who were rejected by the vaults who wouldn't let them in. So they got mad and put those signs in front. :)