1·They had just got out of the taxi and were crossing a road with heavy traffic, where there were no traffic lights or crosswalks. She was hit and killed by a speeding bus.
他们刚下出租车，正要穿越交通拥挤，既无红绿灯又无人行横道的马路，结果她被一辆超速行驶的公交车撞死。
2·But variables like pedestrians in crosswalks, large crowds and vehicle wrecks can throw a carefully designed system out of whack, leading to annoying and pollution-causing traffic jams.
但是，正在穿越人行横道的路人、摩肩接踵的人群以及道路上抛锚的事故车等不确定因素都可能让一套精心设计的系统崩溃失常，导致恼人而又产生污染的交通拥堵。
3·And one of the cornerstones of Beijing's madness is the lack of crosswalks.
而且的基石之一，北京的疯狂是缺乏人行横道。
4·Field observations were carried out at dozens of crosswalks in Xi an.
在西安市选取了数十条人行横道进行实地观测。