![]() ![]() VLT is not an appropriate measurement for non-transparent overlays, such as printed or perforated advertising film. Note that VLT measurements are only relevant to transparent (clear or tinted) overlays. Most vehicle testing stations have a VLT meter so you should see them or a reputable window film installer if you would like to have the VLT of your tinted windows measured (get written confirmation of the overall VLT from the installer if you need to). The overall VLT is checked by using a calibrated VLT meter. This means that if a tinted film overlay of 35% VLT is applied to a front side window that already has 70% VLT, the overall VLT will be well below 35%. If an overlay is applied to a window, the overall VLT is measured as the amount of light passing through both the glass and the overlay. A clear windscreen has a VLT of approximately 85%, although the VLT can be a low as 70%. Visible light transmittance (VLT) is the amount of 'visible' light that passes through a vehicle's windscreen and windows. There are restrictions on overlays because they can reduce the driver's ability to clearly see the road, other road users and potential obstructions. Smaller applications are generally referred to as stickers. It can include clear film, tinted film and advertising film. The term 'overlay' generally refers to self-adhesive or clinging film that is applied to larger areas, or the whole of a window. The legal requirements for window film overlays balance road safety issues with the desire of some vehicle owners to put tinted films, advertising or other artwork on their vehicle windows. The most common modification to windows is the fitting of tinted or advertising window film overlays. Window film overlays and other allowable modifications Replacement windows must also comply with approved standards. Windows originally fitted to vehicles will already comply, depending on the type and age of the vehicle. This is why glazing must comply with approved glazing standards or trade names, as indicated by markings on the glass. Vehicle windows must have certain properties to ensure structural strength and good driver vision. The repair invoice must state that the repairs comply with that standard. The standard specifies the types of damage, the limits to which they can be repaired and the repair methods. The law requires that any windscreen repairs must meet the requirements in the Australian Standard/New Zealand Standard 2366:1999 Windscreen Repairs. A small crack that can be repaired can quickly develop into a large crack that requires the windscreen to be replaced. When a windscreen is damaged, the damage should be repaired as soon as possible to prevent the damage from spreading further and affecting the driver's vision and the windscreen's structural strength. The glazing is structurally sound and securely fitted to the vehicle. The windscreen does not have any scratches, discolouration or other defects that impair vision through it The windscreen and front side windows are kept clean and unobstructed Glazing must be kept in good condition to ensure the driver can see through the windows clearly and can drive the vehicle safely. Safety requirements for vehicle windows (glazing) General safety requirements for windscreen wipe and wash systems and rear-view mirrors. Window film overlays, stickers and other allowable modifications Glazing standards and trade names that glazing must comply with, including requirements for glazing markings General safety requirements for vehicle windows (glazing) The purpose of the rule is to set out minimum safety levels to ensure that adequate vision is provided for the driver, and that glazing material is structurally sound and suitable for use in motor vehicles. The legal requirements for vehicle windows, wipers and mirrors are contained in the Land Transport Rule: Glazing, Windscreen Wipe and Wash, and Mirrors Rule 1999. Guidance on some of the legal requirements relating to your vehicle's windows, wipers and mirrors. ![]()
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