您驶到学校交通管理的人行道，两边的标志栏都已拦上，您什么时候才可以继续行驶？You are approaching a pedestrian crossing managed by school traffic control, and both sides of the barrier are up. When can you continue driving?
在路口没有行人时When there are no pedestrians at the intersection
两边的标志栏收回时When the barriers on both sides are retracted
在您这半边的路口没有行人时When there are no pedestrians at your side of the intersection
在您路口这一侧的标志栏已收缩回时When the barrier on your side of the intersection has retracted