Drivers are just finding out about a 'secret' switch located underneath one of your car's mirrors, and knowing about it could help to prevent potentially fatal accidents.
When you're behind the wheel, it's vital to focus all your attention on the road - but this can be difficult when bright LED headlights start coming at you. In fact, a survey by the RAC found that 90% of drivers have admitted to being 'dazzled' in this way.
But there's a way to help limit the glare of cars that are behind you, and it's all to do with a little-known switch near your rear view mirror.
