What does my dream mean? I run a young woman over with my car, after I thought she would move out of the way?

The fact that the woman is your age, means she represents an aspect of yourself. The car represents your life. You are the driver, therefore, you are in charge of your life. The road is narrow means the path you're traveling in your real life is also narrow. But as the dream shows, it is too narrow, and you have killed off an aspect of yourself.