For the meaning of traffic light signals . image : 78e . gif manually operated stop go signs may be used for control of one - lane - two - way traffic Image : 78e . gif有时候，人手操作的停去字标志，可用以控制单双程的来往车辆。
Researchers measured levels of ultrafine , traffic - produced pollution particles on busy london streets using a newly developed particle counter fitted with a video recorder . the equipment allowed them to match particle levels with each of the five modes of transport 英国研究人员使用一种新开发的微粒计数装置并配备一台录像机，对伦敦一些繁忙街道上因来往车辆而产生的污染物微粒水平进行了测量。
