Which of the following is not considered an authorized emergency vehicle?

The correct answer is that a medical doctor on an emergency call using their personal car is not considered an authorized emergency vehicle. In most jurisdictions, authorized emergency vehicles are specifically designated vehicles that are equipped with lights and sirens and are used by emergency services such as police, fire departments, and ambulances.

While a medical doctor responding to an emergency may have the intention to provide urgent care, their personal vehicle does not have the legal designation of an emergency vehicle unless it is specifically equipped and marked as such. This designation ensures that other drivers on the road can recognize and yield the right of way to legitimate emergency responders.

In contrast, licensed public ambulances, police cruisers, and licensed private ambulances are all recognized as authorized emergency vehicles. They are typically furnished with the necessary equipment, such as emergency lights and sirens, that give them certain privileges on the road, such as the ability to exceed speed limits in emergencies or to disregard certain traffic signals while responding to calls.