The letters on the front of an ambulance are written laterally inverted like ƎƆИA⅃UꓭMA. Give reason.

The letters on the front of an ambulance are written laterally inverted like ƎƆИA⅃UꓭMA so that the driver of the vehicle moving ahead of the ambulance reads the word laterally inverted as AMBULANCE, in his rear view mirror, and gives way to the ambulance first.