In the world of dreams the rules of reality do not necessarily apply. Each dream is unique and it's a direct link to the soul and spirit. Psychology provides its own theories on what dreams mean, but so did tradition and the study of dreams for thousands of years before any relevant science had developed.
Dream Meanings - Gravel
To dream of gravel signifies difficulties. Whether you walk on gravel or simply see it, there will be an unpleasant development that you did not expect.