Is it a violation to privately change the cross sign on an ambulance

Yes. Vehicle modifications are prohibited to include a red cross or blue asterisk because the cross or asterisk is an ambulance symbol. Units or individuals not engaged in pre-hospital medical emergencies are not allowed to use the pre-hospital medical emergencies logo without authorization. An ambulance is a vehicle that rescues patients. The main task is to transfer patients, is the pre-hospital medical emergency work in the important first aid equipment.