I wouldent worry about it, Just drive safe =)
What is to say that any of us will be struck down at any moment.
Worrying about that, it wastes too much energy that you could be using for something else, and for most of us, nixing out our ability to drive a car or sitting shotgun would be next to impossible.

Its hard to say what dreams have meaning and which ones can truely have implications to future events here. Meanings are usualy uniqie to the dreamer, broad analysis tends to be sketchy at best.

So just be aware when you are driving, know your situation, and if you feel an unsafe situation is arising get yourself out of it!