All of the dreams you describe seem to suggest the same emotional anxiety; and from what you have said, they seem to be recurring for you. Recurring dreams mean that some issue or emotional state is needing your attention. All of it relates to some recent situation in your waking life. Let's look at the symbolism of each dream.

In the first dream, you are driving the car. This is important because the car represents how you see yourself moving through life. When you are driving, it means that you feel you are responsible for some aspect or decision in your life which has taken you off course. Asking you close friend and passenger for help is about looking for some support and help in waking life.

In the second dream, you are in a roller coaster (similar to the car) which splits off from the group. This again suggests you have veered off course in life, or at least off course from the rest of your circle of friends and family. Realizing you won't meet up at the end could represent fear of that turn causing serious seperation for you from those you love.

In the third dream, which I am assuming you meant a tsunami (if that is an incorrect assumption, please let me know and I will adjust the interpretation) was coming, the people shift in representation. I believe they no longer represent your support network. Instead, they are aspects of yourself and you are trying to help every part of you escape some disasterous outcome that you see headed your way in life (i.e. losing a job, partner, etc). As you climb the steep, rocky mountain it represents the struggle you are feeling in your life as you try desperately to hang on to some aspect or course in life that is changing. And finally, you reach the top and see the beautiful village. The village is symbollic of possibility for this outcome (whatever the situation or shift in life) to be even better than your past. It is a beautiful metaphor for how your higher self can lead you in the right direction if you will follow. You said that everyone in this dream seemed to feel safer huddled together in a group. It is like some part of you is showing the rest of you that there is hope if you will continue to move forward and climb the difficult mountain that is in front of you in life. But, if you stay frozen in fear, then the tsunami will overcome you and cause a lot of heartache.

Please let me know if you have questions or details you wish to discuss further. Thank you.