Ariz. Rev. Stat. § 28-624 – Authorized emergency vehicles

A. If an authorized emergency vehicle is driven in response to an emergency call, in pursuit of an actual or suspected violator of law or in response to but not on return from a fire alarm, the driver may exercise the privileges provided in this section subject to the conditions stated in this section.
B. If the driver of an authorized emergency vehicle is operating at least one lighted lamp displaying a red or red and blue light or lens visible under normal atmospheric conditions from a distance of five hundred feet to the front of the vehicle, the driver may:
1. 1. Notwithstanding this chapter, park or stand.
2. 2. Proceed past a red or stop signal or stop sign, but only after slowing down as necessary for safe operation.
3. 3. Exceed the prima facie speed limits if the driver does not endanger life or property.
4. 4. Disregard laws or rules governing the direction of movement or turning in specified directions.
C. The exemptions authorized by this section for an authorized emergency vehicle apply only if the driver of the vehicle while in motion sounds an audible signal by bell, siren or exhaust whistle as reasonably necessary and if the vehicle is equipped with at least one lighted lamp displaying a red or red and blue light or lens visible under normal atmospheric conditions from a distance of five hundred feet to the front of the vehicle, except that an authorized emergency vehicle operated as a police vehicle need not be equipped with or display a red or red and blue light or lens visible from in front of the vehicle.
D. This section does not relieve the driver of an authorized emergency vehicle from the duty to drive with due regard for the safety of all persons and does not protect the driver from the consequences of the driver's reckless disregard for the safety of others.