AS-1 line typically extends between 4 and 6 inches parallel to the top of your windshield. AS-1 designation line is typically marked by glass manufacturer on the top edge of your windshield.

Depending on vehicle, your AS-1 strip may already be tinted. In most states windshield tint must not have any reflectiveness, and illegal colors typically include blue and red.

Some state tint laws specify exact number of inches you are allowed to tint on front windshields. Other states define this windscreen area simply as an AS-1 line. Learn more about AS-1 Line.

Federal vehicle ID label found on driver's front door frame will tell you whether your vehicle is classified as passenger or multi purpose vehicle.

• Passenger vehicles include: sedan, coupe, convertible, station wagon, hardtop and hatchback vehicles.
• Multi-purpose vehicles include: SUV, pickup, van, truck, RV, trailer, bus and minibus.

In most states vehicles fall under these two categories.

Civil traffic violation, fines are typically between $165 to $250 for first offense, depending on local enforcement.

Visible light transmission (VLT) measures how much visible light passes through a vehicle window. Law enforcement often uses a tint meter device to measure VLT. However, tint meters are not always perfectly accurate, and readings can vary slightly due to the equipment or measurement conditions.

To account for these small differences, Arizona allows a variance of 3% when measuring window tint. As tint meters are not 100% accurate, the tolerance should never be used to apply darker than legally permitted tint.