Driving in bright sunshine can be blinding, but most motorists assume that carrying a pair of sunglasses in the glovebox is just a matter of personal comfort.
However, failing to have suitable eyewear behind the wheel during severe glare could actually leave you facing a hefty fine and points on your driving licence. While there isn’t a specific law that explicitly says “you must carry sunglasses”, failing to maintain control of your vehicle or driving without due care and attention because you were blinded by the sun carries serious legal consequences.
Here’s how the rules of the road actually apply to bright weather, why improper eyewear can also land you in hot water, and what you need to keep in your car to stay safe and avoid an expensive penalty.
Highway Code Rule 237 covers driving in hot, bright weather.
This particular rule sets out clear instructions for drivers during sunny, hot weather conditions. It requires vehicles to be kept well ventilated to help prevent drowsiness, while also asking drivers to stay alert to road surfaces that may become soft or slippery in extreme heat.
Crucially, the rule also states that drivers must slow down or stop completely if they’re dazzled by bright sunlight while behind the wheel. This specific requirement is where the fine risk actually comes from, since it effectively means every driver needs a way to deal with sun glare.
This effectively means sunglasses are a legal requirement in your car.
Because the rule requires drivers to avoid being blinded by sunlight, keeping a pair of road-legal sunglasses in your glovebox at all times becomes essential, not just a nice extra for sunny days. According to insurance expert Greg Wilson, founder of Quotezone.co.uk, this matters especially in the UK, where sunny weather can appear suddenly and without much warning.
Driving without sunglasses in bright, dazzling conditions, or wearing an unsuitable pair, can leave you exposed to enforcement action under this same rule. Given how unpredictable UK weather tends to be, keeping a spare pair permanently stored in your car removes any risk of being caught without them.
Breaking this rule starts with a fine, but can escalate considerably.
Drivers caught without sunglasses in dazzling conditions, or wearing sunglasses that aren’t suitable for driving, face an immediate one hundred pound fine along with three penalty points on their licence. That alone is a costly consequence for something as simple as forgetting a pair of shades.
If a driver chooses to contest that fine through the courts and loses, the penalty can increase dramatically, up to five thousand pounds, with the possibility of a driving disqualification attached too. This makes it a serious risk rather than a minor technicality worth ignoring.
Not every pair of sunglasses is actually suitable for driving.
It’s not enough to simply own a pair of sunglasses, either, since different lenses transmit varying amounts of light through to your eyes. Sunglasses that only let through between three and eight percent of light are considered too dark for driving and shouldn’t be worn behind the wheel at all.
An optician should be able to advise on the correct level of tint specifically suited for driving, rather than sunglasses bought purely for general everyday wear. Getting this wrong could mean you’re technically still breaking the rule, even while wearing sunglasses you assumed were perfectly fine.
The AA has also warned about choosing the right style.
Beyond just lens darkness, the AA has previously warned that sunglasses sold for general, everyday use can sometimes be too dark specifically for driving conditions. This makes it worth checking exactly what a pair is designed for before assuming they’re suitable for use in the car.
Fashion oriented frames can also cause a separate problem entirely, since chunky or oversized styles can obscure your peripheral vision if they’re not designed with driving in mind. The AA recommends choosing driving sunglasses carefully, rather than simply grabbing whatever pair happens to be nearby on a sunny morning.
What this actually means for your next drive
Given how easily this rule can be broken without realising it, the simplest fix is keeping sunglasses permanently stored in your glove box rather than relying on remembering to bring them each time. That way, you’re covered the moment bright sunlight appears, regardless of how little warning UK weather tends to give.
Checking with an optician about the right lens tint for driving, and avoiding oversized fashion frames while behind the wheel, are both simple ways to make sure you’re compliant rather than just assuming you are. It’s a small habit that could save you from a fine running into the thousands over something as avoidable as forgetting the right pair of sunglasses.
