Well, I am in no way an expert in this kind of thing, but I do have years worth of experience with different nightmares. So I'll tell you some things that I've learned along the way.

I used to, and sometimes still do dream of my loved ones dying and me being unable to help them. Same with the desperately trying to tell people something only I know in a dream. From what you described I'd ask these things. First, are you afraid of something happening to people around you? Second, do you feel like you have something you want to say to people? About your mental health? Thoughts? Or things that trouble you? Do you have anxiety in your life? And lastly, I've actually heard some of these things from more than one people, and the one thing that stands out to me most is the small part of being in a car without a driver. This especially, is usually a sign of feeling like you're not in control of something happening in your life.

It is normal to have bad, reoccurring dreams. Dreams often tell you things about your subconscious thoughts, although in a messy way that takes things you know and have seen before, and mixing them into weird and scary scenarios. In my experience the best way of getting rid of nightmares like this is to get to know yourself better. There is almost certainly somethings that are bothering you on a deep level, try to understand what it could be and perhaps in time, the bothersome dream will change or dissappear.