"左側通行" (left-side traffic) refers to the practice of driving on the left side of the road. This system is used in several countries, including 日本 and イギリス. Vehicles are designed to accommodate this traffic flow, with the driver's seat typically located on the right side of the car. In regions where "左側通行" is the norm, road signs and signals are also oriented to support this driving pattern. This system helps maintain order and safety on the roads, as it allows for predictable interactions between vehicles and pedestrians.