Hi Joko, I have done a good No of years Motorway HGV driving, as you know all the Traffic are sectioned by the Central Barrier, the accidents I have seen have been caused by lack of understanding, lack of concentration, not knowing where you are, last min judgment ( OH that's the junction I need) sod everyone else IN TURN causing one hell of a pile up, seen it, seen the video, Underestimation of speed, dropping to sleep ( Yes, this does happen) if someone has said to you that they have not they are liers ( Been there) as many others will tell you,not getting well over on the hard shoulder when broken down & opening their bloody doors when a HGV passes ( In-turn can suck them out, you think I am joking!! far from it, & Lastly travelling to close, if people forward thought half of the accidents would not happen but while motorists think that it will not happen to me & that sort of attitude then Motorway pile up's will always occur. Have a safe one.