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RAC issues fine warning to UK drivers over common summer mistake
The RAC said category four lenses can impair vision and may lead to a fine, three penalty points or careless driving charges.
The RAC warns motorists that wearing sunglasses that are too dark could be illegal and unsafe while driving. Policy officer Harriet Hernando urges drivers to check labels to avoid potential fines and penalty points.
Sunglasses rated as 'Category four' on the Visible Light Transmission scale are designed for extreme brightness like high-altitude mountaineering. These lenses allow only a small percentage of daylight through, significantly reducing a driver's ability to spot hazards.
Under Section 96 of the Road Traffic Act, it is an offence to drive if eyesight falls below required standards. The Highway Code's Rule 94 advises against tinted lenses at night or in poor visibility if they limit vision.
Category three sunglasses are recommended for daytime driving as they provide effective sun protection without compromising visibility. Category two lenses offer balance between glare reduction and clarity, while category one lenses remain legal for daytime use.
With the current summer heatwave, choosing appropriate eyewear is essential for road safety. Drivers should verify the category rating on their packaging to ensure compliance with legal standards and maintain clear visibility.