Brits Drive on the Left So Our Swords Don't Get Caught
Globally, driving on the right is more common. This means the vehicles will be left-hand drives, which suits the right-handed majority of drivers, as it means they can change gears with their dominant right hand. However, the British had a more important consideration — self-defense. A rider on the left is shielded by buildings on their weaker side, and can more easily draw their sword with their dominant hand. This is indeed a safer configuration ... if you organized your streets back when the most important users were on horseback!