What must every motor vehicle in Arizona have while being operated?

In Arizona, it is mandatory for every motor vehicle being operated on public roads to have proof of insurance. This is a legal requirement designed to ensure that all drivers carry insurance coverage that can financially protect themselves and others in the event of an accident. Having proof of insurance not only helps drivers meet their legal obligations, but it also promotes responsible driving by encouraging individuals to be financially prepared for potential damages or injuries that may occur during an incident.

While drivers must have a valid driver's license to operate a vehicle, and title documents are necessary for vehicle ownership, those requirements pertain to licensing and ownership rather than the act of operating the vehicle itself. The requirement for proof of warranty does not apply to everyday vehicle operation, making insurance the most relevant requirement in this context.