noun
pedestrian crossing the road; road crosser
A pedestrian who is in the act of crossing a road, often used in traffic safety or legal contexts.
横断歩行者がいるので、車は一時停止しなければならない。
Because there is a pedestrian crossing the road, the car must come to a temporary stop.
この交差点では横断歩行者に注意してください。
Please watch out for pedestrians crossing the road at this intersection.
Compound of 横断 (crossing) + 歩行者 (pedestrian). The exact historical derivation is uncertain, but the word is transparently formed from its components.