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I had a dream where I was driving down the street, picking up stuff for something (A garage sale, maybe?)
Travel in any form can represent a path taken in life. It can also represent transition. You are picking things up, for like a garage sale, on this road in your life. Since nothing really came out as particularly striking I guess the things you are picking up are extra bagage - stress.
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All of a sudden, I see a nun standing in the median (A man is standing next to her.)
The nun represent salvation. Your religion can offer you a way out. A way to deal with your extra bagage and move on. The non-descript man standing next to the nun probably represents your father. Thats a typical freudian answer though. It could also be a brother, husband, close friend or lover. But because i have only a man to go on I really can tell you for certain his purpose and only gesture a guess in context with the rest of the dream. I think that you may have a strained relationship with some male figure in yourlife and that by seeing him next to the nun I think its time you deal this relationship. Confront the man in your dreams in real life and try to work out any differences. Maybe the problem isn't a bad relationship rather just a neglected one. Consider seeking religious counciling.