Final answer:
In some countries, driving on the left side of the road is permitted due to historical origins. Examples include the United Kingdom and Japan.
Step-by-step explanation:
In most countries, driving is done on the right side of the road. However, there are a few exceptions where driving on the left side of the road is permitted. One of the most well-known exceptions is the United Kingdom, where traffic drives on the left side. Another example is Japan, where traffic also drives on the left side of the road.
These exceptions have historical origins. In the past, many people, including soldiers, rode horses on the left side of the road to have their right hand, which was usually the dominant hand, free to defend themselves or greet others. Since then, the practice of riding or driving on the left side has been carried on in these countries.