Why do some European countries drive on the left side of the road?

The reason why some European countries drive on the left side of the road dates back to the Middle Ages when people primarily traveled on horseback. Most people were right-handed, and the swords they carried were worn on their left side. This meant that it was easier for them to mount their horses from the left side, which led to riding on the left side of the road. This practice was later adopted by early motor vehicles, and it continued in countries like the United Kingdom, Ireland, and Malta.

However, most European countries, as well as countries around the world, drive on the right side of the road. This is believed to be due to a combination of factors, including the influence of Napoleon Bonaparte, who introduced right-hand driving in the countries he conquered, and the fact that the majority of people are right-handed and find it easier to drive on the right side of the road.