从你的这段叙述看,我觉得警察的判断基本是正确的。
I turned signal while I turned---变线没有提前打信号灯,换线的过程才打信号;
checked the rightest lane and the middle lane were clear.--看来你是一气呵成,连换三条线,否则,你不会说检查中线和最右线。
I made my change successfully, and I was a little bit slow on the rightest lane since I was about to turn right along Marivale at Clyde “DQ”, and it was raining at that time, and I drove very careful. PS, there were traffic on my lane on front of me, and it’s impossible for me to move along very fast.
At that point, that car hit me from the middle lane at my left back bumper。
这里有点矛盾。既然你已经换线完成,中线行使的车怎么会撞倒右线行驶的车上呢?
从你的叙述,很容易让人得出这样结论:你连变三条线,而且,由于最右边是转弯线,还有车,所以,你边换线边减速,最后,换到最右边,但车屁股还厥在中线一部分,很慢的行驶。而且,你没有提前打信号灯,是换线过程中才给的信号,以至于在中线正常行驶的车辆,来不及反应。匆忙中,中线车为避让你(还有雨,路滑),急忙打方向盘避到最左边(最后停到左边停车场)。