In Japan, many children in the lower grade of primary school join in a road-crossing skills training program at school. This study describes differences in crossing behavior of lower-grade children before and after completing the Japanese common training. Children’s crossing behavior in a school gymnasium was observed before and after completion of the common training. The results of observation indicated that children tended to look all around for traffic frequently but not carefully even after they had undergone the common training. It was necessary to develop new training programs for solving this problem.