Image Credit: Zeelool Glasses/UnsplashAnother bizarre story from the world of UK motoring and drivers has emerged. Drivers are being urged to check their sunglasses immediately, as there is a little-known law that could see many drivers pick up a hefty fine if they end up falling foul of it.According to YorkshireLive, the RAC has said that sunglasses are incredibly useful for cutting glare in bright weather when driving. This has been particularly useful in the UK recently, as the hot weather has led to huge spells of sunshine, which of course can get into people's eyes when driving.But there are other things to consider when wearing sunglasses in a car. This is the Visible Light Transmission, or VLT. The lenses on sunglasses have to let a reasonable amount of light through, so as not to dull things so much that drivers can't see some things that are ahead of them.AdvertisementAdvertisementThis is of particular note when it comes to spotting hazards, other road users, or anything else that could cause problems in front of you. This isn't a law that many in the UK will know about, and being caught with sunglasses that are too dark could result in a fine.This Is What the Law on Sunglasses SaysImage Credit: Old Youth/UnsplashThere are different categories of lenses on the tint scale, and those labelled category 4 allow the smallest amount of light through them. These lenses could be an issue as they could prevent drivers from seeing any hazards in front of them. The same is also true if there is a sudden storm or heavy rain while out in the summer.The RAC points to Section 96 of the Road Traffic Act 1988. This makes it illegal to drive on UK roads if your eyesight does not meet the legal standard. It, of course, covers general vision impairment, but also impairment caused by overly dark sunglasses. There are various penalties that drivers could face if they fall foul.Fines are, of course, one of them. But penalty points on your licence are another, and if you accumulate enough of those in the UK, you will be banned from driving. There is Highway Code guidance too, under Rule 94. It advises motorists not to use tinted glasses, lenses, or visors at night. Rule 94 also states that if sunglasses affect your ability to see other road users or hazards, it could be viewed as careless or even dangerous driving.These Are the Best Sunglasses for DrivingThe RAC has said that the best sunglasses for driving are those in category three. These offer the best level of protection from the sun in the day, without being excessively dark when it comes to seeing hazards and everything around you. Category two sunglasses are also considered good for daytime driving when it is a gorgeous, sunny summer's day.AdvertisementAdvertisementIf you are involved in an accident with eyewear deemed unsuitable, you could face prosecution. That is how seriously it is taken in the United Kingdom. "All sunglasses should carry the CE mark and meet the European Standard BS EN 1836:2005," says the AA. "A good quality anti-reflection coating is recommended, along with a hard coating to protect the lenses from scratches. Sunglasses with deep side arms can block side, or peripheral, vision and are not recommended for driving."If you want more stories like this, follow Guessing Headlights on Yahoo so you don't miss what's coming next.