Emergency Ambulances - What Are the Lights and Sirens?

The very first motorized ambulances had these electric lights that were mounted on the outside to lm people be alerted to the fact that there was an ambulance coming through. You can't really tell, except to say that, statistically speaking, it's far more likely, if the siren is on and the lights are going that there is not a patient in the back. They often will not use the lights or sirens unless the patient is in a critical state where they absolutely need to be able to get to health carn the hospital as soon as possible.