The short answer
Arizona does not use a universal five- or six-inch rule for a windshield sun strip. The statute allows transparent material on the topmost portion when its bottom edge is at least 29 inches above the undepressed driver's seat. The measurement is taken on a level surface from a point five inches in front of the bottom of the seat back, with the driver's seat in its rearmost and lowermost position. The permitted strip may not be red or amber.
Outside that exception and limited sticker or equipment exceptions, Arizona generally prohibits applying transparent material that alters color or reduces light transmission through the windshield. An AS-1 marking can help identify a vehicle manufacturer's reference line, but Arizona's statute states the 29-inch method rather than making AS-1 the legal test. Do not assume that a nearly clear ultraviolet or heat-control film is automatically lawful across the full windshield; even clear-looking material may change measured transmission. Have the exact vehicle and product reviewed before installation, and keep the driver's view, sensors, cameras and required glass markings unobstructed.
