noun
driving on the left side of the road; left-hand traffic
Refers to the traffic system where vehicles keep to the left side of the road, as in Japan and the UK. Often contrasted with 右側通行 (right-hand traffic).
See also: 右側通行
日本では左側通行が法律で決められている。
In Japan, driving on the left side of the road is mandated by law.
イギリスも左側通行の国です。
The UK is also a country with left-hand traffic.