Which of the following vehicles is NOT classified as an emergency response vehicle?

The classification of vehicles as emergency response vehicles typically includes those that are specifically designed to respond to emergencies, provide aid in emergency situations, or allow for a rapid response to incidents. Fire trucks, ambulances, and law enforcement vehicles all fall under this category, as they are equipped to provide critical services during emergencies.

A commercial bus does not serve this function; it is primarily designed for transporting passengers along designated routes and is not specifically built or equipped to deal with emergencies or provide urgent assistance. Therefore, it is not classified as an emergency response vehicle. Understanding these distinctions is essential when recognizing the roles and responsibilities associated with each type of vehicle.