एम्बुलेंस को उल्टा क्यों लिखा जाता है? Ambulance Inscription: Rear-View Mirror Readability

Why Ambulance Signs are Laterally Inverted:
In order to convey the vehicle in front that it is an ambulance, it is written laterally inverted. When the driver of the vehicle in front reads through the rear-view mirror, the Image of this inscription, through lateral inversion, form a right oriented image.
एम्बुलेंस को उल्टा क्यों लिखा जाता है?