You should only cross when there is a red light stopping the traffic on the road you wish to cross 你应该在红色停车灯号亮著和车辆停定后,才横过马路。
Once you are sure the traffic light for drivers is showing red and that the traffic has stopped , then it may be safe to cross 要确定红色停车灯已亮著,及车辆经已停定,才可横过马路。