Short answers, pulled from the story.
The 1966 White Paper titled Accidental Death and Disability: The Neglected Disease of Modern Society exposed that ambulance services were unregulated and untrained, forcing governments to create standards for construction and equipment. This report transformed emergency medical services from simple transport into life-saving medical interventions by jolting the structure of organized medicine.
The first motorized ambulance arrived at Michael Reese Hospital in Chicago in February 1899 and was powered by a 2-horsepower electric motor. This vehicle marked a significant evolution from the horse-drawn ambulances volantes designed by Dominique Jean Larrey during the campaigns of 1794 and 1796.
The Golden Hour theory posits that a trauma victim's best chance for survival lies in an operating room within one hour of the traumatic event. This urgency created the platinum ten minutes rule which dictates that patients should be transported within ten minutes of the ambulance's arrival on scene.
In English-speaking countries the paramedic is the highest licensure level of prehospital emergency care with skills including intravenous therapy and endotracheal intubation. The Notarzt system in Germany relies on doctors and nurses to perform all medical interventions with paramedics serving as assistants who require physician permission to administer treatments.
The National Institute for Occupational Safety and Health established that sprains and strains account for 41% of all injuries to EMS clinicians. The most lethal hazard is ground and air ambulance crashes which make up the highest rate of lethality for EMS workers despite other risks from violent patients and infectious diseases.
In the United Kingdom almost all emergency ambulances are part of a national health system while in the United States they are often municipal third services fire-linked or private corporations. Developing nations often rely on transport-only services where taxi drivers and undertakers serve as the primary means of moving patients to hospitals.