This is the 3585th most frequent Japanese word.
走行
"走行" means "traveling" or "running (of a vehicle)."
走行 (soukou) is used to describe the action of a vehicle traveling or moving on a road.
車は高速道路を走行しています。
The car is traveling on the highway.
走行 (soukou) here refers to the travel or movement distance covered, often calculated or measured.
自転車の走行距離を測っています。
I am measuring the travel distance of my bicycle.
走行 (soukou) is employed to denote the action of driving or moving during a specific condition or time.