From Arizona Revised Statutes:

A.R.S. § 28-2485. Safety requirements; compliance

Notwithstanding any other law, a motor vehicle that is eligible to be licensed under this article is in compliance with the safety requirements of the laws of this state relating to motor vehicles if the original safety equipment placed on the motor vehicle by the manufacturer of the motor vehicle is in good operating condition or if the original equipment has been replaced by equipment equal to or more efficient than the original equipment.

A.R.S. § 28-943. Single beam road lighting equipment

Head lamps that are arranged to provide a single distribution of light are permitted on motor vehicles manufactured and sold before January 1, 1951, and on neighborhood electric vehicles, in lieu of multiple beam road lighting equipment specified in this article, if the single distribution of light complies with the following requirements and limitations:

1. The head lamps are aimed so that when the vehicle is not loaded none of the high intensity portion of the light projects, at a distance of twenty-five feet ahead, higher than a level of five inches below the level of the center of the lamp that is aimed and in no case higher than forty-two inches above the level on which the vehicle stands at a distance of seventy-five feet ahead.

2. The intensity is sufficient to reveal persons and vehicles at a distance of at least two hundred feet.

A.R.S. § 28-947. Special restrictions on lamps

A. A person shall direct a lighted lamp or illuminating device on a motor vehicle, other than a head lamp, spot lamp, auxiliary lamp or flashing front direction signal, that projects a beam of light of an intensity greater than three hundred candlepower so that no part of the beam strikes the level of the roadway on which the vehicle stands at a distance of more than seventy-five feet from the vehicle.

B. A person shall not drive or move a vehicle or equipment on a highway with a lamp or device on the vehicle that is capable of displaying a red or red and blue light or lens visible from directly in front of the center of the vehicle. Lights visible from the front of a vehicle shall be amber or white. This section does not apply to either of the following:

1. 1. An authorized emergency vehicle or a vehicle on which a red or red and blue light or lens visible from the front is expressly authorized or required by this chapter.
2. 2. An emergency vehicle that is solely used for hobby or display purposes and that has been issued a historic vehicle license plate pursuant to § 28-2484 if either of the following applies:
   1. (a) The lights are covered and are not activated while a person is transporting or driving the vehicle to or from a parade, authorized assemblage of historic vehicles or test.
   2. (b) The lights are activated only in a parade, for an authorized assemblage of historic vehicles or for testing purposes.
       
3. C. Except as provided in subsection D or E of this section, flashing lights on motor vehicles are prohibited except either:

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A.R.S. § 28-954. Horns and warning devices
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C. A vehicle shall not be equipped with and a person shall not use on a vehicle a siren, whistle or bell, except as otherwise permitted in this section.
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F. A siren shall be allowed on a fire engine that is solely used for hobby or display purposes and that has been issued a historic vehicle license plate pursuant to § 28-2484 if either of the following applies:

1. The siren is covered and is not activated while a person is transporting or driving the vehicle to or from a parade, authorized assemblage of historic vehicles or test.

2. The siren is activated only in a parade, for an authorized assemblage of historic vehicles or for testing purposes.

A.R.S. § 28-957.01. Windshields required

A. The following vehicles shall be equipped with an adequate windshield:

1. 1. A passenger vehicle, except a motorcycle, an all-terrain vehicle and a golf cart manufactured or modified before June 17, 1998.
2. 2. A motor truck or truck tractor, except fire trucks, fire engines or other fire apparatus, whether publicly or privately owned.

B. This section does not apply to an implement of husbandry or to an antique, classic or horseless carriage automobile if it was not originally equipped with a windshield.

A.R.S. § 28-958.01. Rear fender splash guards

A. A person shall not operate a truck, trailer, semitrailer or bus on a highway unless the vehicle is equipped with rear fender splash guards that comply with the specifications provided in this section.

B. The splash guards:

1. 1. Shall be attached in a manner that prevents the splashing of mud or water on the windshield of other motor vehicles.
2. 2. Shall extend to a length of not more than eight inches from the ground.
3. 3. Shall be wide enough to cover the full tread or treads of the tires being protected.
4. 4. Shall be installed close enough to the tread surface of the tire or wheel to control the side throw of the bulk of the thrown road surface material.
5. 5. May be constructed of a flexible rubberized material.
6. 6. Shall be attached in a manner that, regardless of movement either in the splash guards or the vehicle, the splash guards retain their general parallel relationship to the tread surface of the tire or wheel under all ordinary operating conditions.

C. This section does not apply to:

1. 1. A vehicle commonly known as a pickup truck with a manufacturer's gross vehicle weight rating of ten thousand pounds or less, except that this section applies if the pickup truck has been modified from the original bumper height design to raise the center of gravity of the pickup truck.