Premonition
If you dream about a premonition that something is going to happen this doesn't necessarily mean that it will happen in real life. If you have a history of dreaming about accidents before they happen then you should be cautious.
For the most part we have dreams about traumatic events because our subconscious mind can't come out an just give us messages with words. It must find creative images to communicate with you. The better you can understand these messages, the better you can control your destiny in the real world.
Who is the premonition about? No matter who is involved, all of the people in the dream is a basic characteristic in you.