grade-separated pedestrian crossing 分层行人过路处

grade crossing watchman 道口看守工

at grade pedestrian crossing 地面行人过路处

grade crossing predictor 道口信号预报器

cross barrier at grade crossing 道囗栏木 ; 道口栏木

grade crossing signal 道口信号机

separate grade crossing 立体交叉道

side barrier at grade crossing 道囗栅栏 ; 道口栅栏