That extra coffee might wake you up, but it could also be wrecking your driving focus – here’s why caffeine behind the wheel isn’t always your friend

Coffee – it’s the legal performance enhancer that fuels early mornings, late nights and long motorway hauls. Most of us can’t even start an ignition, let alone a working day, without one. But here’s the shocker – too much caffeine might actually make you a worse driver. According to a new UK survey, 11 million drivers regularly exceed the safe daily caffeine limit of 400 milligrams – that’s about two barista coffees, four cups of tea, or five cans of energy drink. Go over that, and you might start to feel like you’ve traded your steering wheel for a fidget toy.