natural disaster or man-made disaster disaster

judyzhu

Recent year, there are so many disaster happened in all over the world. earthquake,typhoon, aridity,waterflood, mud-rok flow, and so on, which have serious effect people's life and property. natural disaster, we have no word.  
but recently, we can see a lot information of the accident about the transport .
a coach is burnt in highway, the bullet train run out the track, bridges collapse. what a terrible thing!
this accident happened so frequently, we can trust which kind transport? by bus,buy train or just by bicyle.