If the sidewalk is straight, then it represents the straight and narrow road.
If you dream of walking on the sidewalk, then this represents a safe place, perhaps the straight and narrow road that signifies safety in the midst of a hectic life, and that you are paving the way to your success. See Road.... Strangest Dream Explanations
Life’s path. What is happening on the street is normal and available to everybody. Important is the condition of the street and possibly the direction in which you are walking. Who or what are you meeting on the street? What is your destination? Intersections symbolize decisions, street signs are an aid in finding direction.
According to Freud, sexual organs. According to Jung, the collective world of awareness.... Little Giant Encyclopedia