楼主是早年来的高端人口?谈个交规居然还要匿名?我还回答一下你的第二条吧,以下文字copy自本地网站
If you are travelling on a three lane motorway and are in the left hand lane but need to move to the middle lane, check that any vehicles travelling in the right hand lane are alongside you, as to eliminate the possibility of them also wanting to move into the middle lane and causing a collision.