Why is ambulance written normally on the side of the vehicle but not on the front?

Ambulance is written normally on the side of the vehicle to ensure that it is easily readable to other drivers when the ambulance is approaching from behind. However, on the front, the Word is often reversed or mirrored so that it appears correctly in the rearview mirrors of vehicles ahead, allowing drivers to quickly recognize the emergency vehicle and yield the right of way. This design enhances visibility and safety during emergencies.