RAC issues fine warning to UK drivers over common mistake

With the UK experiencing its fourth summer heatwave, road safety experts are reminding drivers that not all sunglasses are suitable for use behind the wheel, and wearing the wrong type could lead to penalties.

The concern centres on sunglasses rated as ‘category four’ on the Visible Light Transmission (VLT) scale, which allow only a small percentage of daylight through and are designed for very bright environments such as high-altitude mountaineering.

Under Section 96 of the Road Traffic Act 1988, it is an offence to drive if your eyesight falls below the required legal standard – something that could occur if overly dark sunglasses compromise your ability to see clearly.

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This could result in a fine and three penalty points.

Harriet Hernando, policy officer at the RAC, said: “Most of us will be reaching for our sunglasses this week, but many will not realise that the darkest of shades could be unsuitable for driving, and even illegal in the case of category four sunglasses.

“We urge drivers to check their sunglasses, especially if they are normally used for extremely bright conditions, such as high-altitude mountain environments.

“These will be unsafe for driving, could impair your vision, and even lead to a fine and penalty points.”

The Highway Code’s Rule 94 advises against using tinted glasses, lenses, or visors at night or in poor visibility if they limit how well you can see.

Sunglasses that reduce a driver’s ability to spot hazards may also be considered a factor in careless or dangerous driving.

Category three sunglasses are recommended for daytime driving as they provide effective sun protection without compromising visibility.

Category two lenses are also deemed suitable, offering a balance between glare reduction and clear vision during the day, but should not be worn at night or in low light.

Category one sunglasses are intended for low sunlight conditions and offer only minimal glare protection, but remain legal for daytime driving.

Drivers are advised to check the category rating found on the label of the packaging of their sunglasses before using them while driving.