The warning is normally placed before a pedestrian crossing. Look for people approaching or using the crossing and be ready to stop.
Poland A-16 and France A13b use red-bordered triangles showing a pedestrian on crossing stripes. The United States W11-2 is a yellow or fluorescent yellow-green diamond with a walking figure. It can warn of pedestrians without indicating a marked crossing. Japan 407-A is a blue sign marking the crossing itself.