Which of the following is considered an authorized emergency vehicle?

An authorized emergency vehicle is defined as any vehicle that is used by public safety agencies to respond to emergencies, including fire, medical, and police situations. The chartered rescue squad is an example of such a vehicle, as it is specifically designed and equipped to provide emergency medical services and response capabilities. This classification grants the vehicle certain privileges on the road, such as the ability to exceed speed limits and the right of way in specific scenarios when responding to emergencies.

In contrast, the other options listed do not fulfill the criteria of authorized emergency vehicles. A door-to-door service van operates within a commercial capacity without any emergency response capabilities. A city transport bus serves public transportation needs and does not engage in emergency services. Similarly, a private security vehicle, while it may provide some security services, does not meet the established criteria as a designated emergency response vehicle and lacks the legal authority typically granted to vehicles like the chartered rescue squad.