I closed my eyes and for a moment I saw a car driving straight at me
I was afraid that it might mean
I would be hit by a car
The next day I got up I drove
Along the way I met in the moments before my arrival
the accident happened
Car collided with a motorcycle
In your dream you collided with the car, not somebody else riding a motorcycle.
I'd rather not interrupt the stream of my consciousness
1-Phowa or rainbow body,guarantee the continuation of the stream of consciousness after death of body?
The stream of consciousness is interrupted temporarily at the time of death, for some practitioners it is not interrupted at all but is experienced as clear light. But I seem to get the feeling that you mean that you fear losing this particular combination of skhanda. Why concern yourself with that? Since you were born you have experienced an infinite combination of skhanda, death is just another stage in this everchanging and impermanent group of processes which we call "me".
Do you have the same fear when falling asleep? You momentarily lose consciousness there, and then wake up as a different "self"? I recommend you find a good teacher to show you dream yoga, or at least to effectively explain to you the illusory nature of this existence.
2-If still meet death on my way,I should learn some practices
which could quickly and quietly perform the scene of the accident?
The simplest practice is the six syllable mantra or the mantra of Amitabha connected with a strong and heartfelt aspiration for the being to be reborn in the pure land of Potala or Dewachen. The Dewachen aspiration prayer
is another option.
It will require a ritual reading from a teacher.
Phowa for others is also an option, but this will require you to find a teacher to: 1. give you the practice and explanaions, 2. give you ngondro (preliminary practice, normally 100,000 repitions of the Amitabha mantra) and 3. a retreat on the practice.