Question

why the word ambulance is painted left right inversed on the vehicle​

Answer 1

the ambulance is painted inverses so that the person driving the vehicle ahead the ambulance can see it in the rear mirror an immediately notice it and gives it the way .

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Answer 2

The word AMBULANCE is written or painted left right inversed (laterally inverted) in front of the ambulance because when seen in the rear view mirror by another vehicle, the image of the word would get inverted, letting the driver to read the word properly so that he can provide way to the ambulance.